Improves proxy support
- Automatically detect and dehyphenise https proxies which use EZProxy
HttpsHyphens
- Web translators now pass around Zotero.Proxy instances which can
proxify/deproxify urls passed to `translate.setLocation()` before calling
`translate.getTranslators()`/ translate.detect()`. The proxy passing is
done within connector background/injected processes and between
standalone and connectors.
- Proxy protocol unified with connectors. Connectors can now pass
proxies to `/connector/save_items`. The proxies will be used to resolve
true item and attachment urls when saving.
Closeszotero/zotero#578, zotero/zotero#721
Relevant zotero/zotero#34, zotero/zotero#556
