Remove unused code; move signal.js to js/modules for eslint

(noticed as I was doing this that signal.js doesn't get eslint coverage)

js/modules/link_text.d.ts

@@ -1,12 +0,0 @@
-declare namespace LinkText {
-  type Attributes = {
-    [key: string]: string;
-  };
-}
-
-declare function linkText(
-  value: string,
-  attributes: LinkText.Attributes
-): string;
-
-export = linkText;

js/modules/link_text.js

@@ -1,39 +0,0 @@
-// Fork of https://github.com/uiureo/link-text with HTML escaping disabled as we leverage
-// jQuery’s escaping mechanism:
-
-const linkify = require('linkify-it')();
-
-function createLink(url, text, attrs = {}) {
-  const html = [];
-  html.push('<a ');
-  html.push(`href="${url}"`);
-  Object.keys(attrs).forEach(key => {
-    html.push(` ${key}="${attrs[key]}"`);
-  });
-  html.push('>');
-  html.push(decodeURIComponent(text));
-  html.push('</a>');
-
-  return html.join('');
-}
-
-module.exports = (text, attrs = {}) => {
-  const matchData = linkify.match(text) || [];
-
-  const result = [];
-  let last = 0;
-
-  matchData.forEach(match => {
-    if (last < match.index) {
-      result.push(text.slice(last, match.index));
-    }
-
-    result.push(createLink(match.url, match.text, attrs));
-
-    last = match.lastIndex;
-  });
-
-  result.push(text.slice(last));
-
-  return result.join('');
-};

js/modules/signal.js

@@ -1,60 +1,59 @@
 // The idea with this file is to make it webpackable for the style guide
 
-const Backbone = require('../ts/backbone');
-const Crypto = require('./modules/crypto');
-const Database = require('./modules/database');
-const Emoji = require('../ts/util/emoji');
-const HTML = require('../ts/html');
-const Message = require('./modules/types/message');
-const Notifications = require('../ts/notifications');
-const OS = require('../ts/OS');
-const Settings = require('./modules/settings');
-const Startup = require('./modules/startup');
-const Util = require('../ts/util');
+const Backbone = require('../../ts/backbone');
+const Crypto = require('./crypto');
+const Database = require('./database');
+const Emoji = require('../../ts/util/emoji');
+const Message = require('./types/message');
+const Notifications = require('../../ts/notifications');
+const OS = require('../../ts/OS');
+const Settings = require('./settings');
+const Startup = require('./startup');
+const Util = require('../../ts/util');
 
 // Components
 const {
   ContactDetail,
-} = require('../ts/components/conversation/ContactDetail');
-const { ContactName } = require('../ts/components/conversation/ContactName');
+} = require('../../ts/components/conversation/ContactDetail');
+const { ContactName } = require('../../ts/components/conversation/ContactName');
 const {
   ConversationTitle,
-} = require('../ts/components/conversation/ConversationTitle');
+} = require('../../ts/components/conversation/ConversationTitle');
 const {
   EmbeddedContact,
-} = require('../ts/components/conversation/EmbeddedContact');
-const { Emojify } = require('../ts/components/conversation/Emojify');
-const { Lightbox } = require('../ts/components/Lightbox');
-const { LightboxGallery } = require('../ts/components/LightboxGallery');
+} = require('../../ts/components/conversation/EmbeddedContact');
+const { Emojify } = require('../../ts/components/conversation/Emojify');
+const { Lightbox } = require('../../ts/components/Lightbox');
+const { LightboxGallery } = require('../../ts/components/LightboxGallery');
 const {
   MediaGallery,
-} = require('../ts/components/conversation/media-gallery/MediaGallery');
-const { MessageBody } = require('../ts/components/conversation/MessageBody');
-const { Quote } = require('../ts/components/conversation/Quote');
+} = require('../../ts/components/conversation/media-gallery/MediaGallery');
+const { MessageBody } = require('../../ts/components/conversation/MessageBody');
+const { Quote } = require('../../ts/components/conversation/Quote');
 
 // Migrations
 const {
   getPlaceholderMigrations,
-} = require('./modules/migrations/get_placeholder_migrations');
+} = require('./migrations/get_placeholder_migrations');
 
-const Migrations0DatabaseWithAttachmentData = require('./modules/migrations/migrations_0_database_with_attachment_data');
-const Migrations1DatabaseWithoutAttachmentData = require('./modules/migrations/migrations_1_database_without_attachment_data');
+const Migrations0DatabaseWithAttachmentData = require('./migrations/migrations_0_database_with_attachment_data');
+const Migrations1DatabaseWithoutAttachmentData = require('./migrations/migrations_1_database_without_attachment_data');
 
 // Types
-const AttachmentType = require('./modules/types/attachment');
-const Contact = require('../ts/types/Contact');
-const Conversation = require('../ts/types/Conversation');
-const Errors = require('./modules/types/errors');
-const MediaGalleryMessage = require('../ts/components/conversation/media-gallery/types/Message');
-const MIME = require('../ts/types/MIME');
-const SettingsType = require('../ts/types/Settings');
+const AttachmentType = require('./types/attachment');
+const Contact = require('../../ts/types/Contact');
+const Conversation = require('../../ts/types/Conversation');
+const Errors = require('./types/errors');
+const MediaGalleryMessage = require('../../ts/components/conversation/media-gallery/types/Message');
+const MIME = require('../../ts/types/MIME');
+const SettingsType = require('../../ts/types/Settings');
 
 // Views
-const Initialization = require('./modules/views/initialization');
+const Initialization = require('./views/initialization');
 
 // Workflow
-const { IdleDetector } = require('./modules/idle_detector');
-const MessageDataMigrator = require('./modules/messages_data_migrator');
+const { IdleDetector } = require('./idle_detector');
+const MessageDataMigrator = require('./messages_data_migrator');
 
 exports.setup = (options = {}) => {
   const { Attachments, userDataPath, getRegionCode } = options;
@@ -127,7 +126,6 @@ exports.setup = (options = {}) => {
     Crypto,
     Database,
     Emoji,
-    HTML,
     Migrations,
     Notifications,
     OS,