* build: build squirrel and its dependencies from source
* chore: do not use fork for squirrel.mac
* build: do not ship headers with dependency frameworks
* Update BUILD.gn
* chore: s/striped/stripped
* chore: update as per feedback
* chore: use ARC and fix build errors
* chore: fix ARC Squirrel self retainer
* refactor: convert methods of AutoUpdater to gin
* refactor: converter in map_converter.h is no more needed
* refactor: use gin in crash_reporter
* refactor: remove native_mate_converters/map_converter.h
* refactor: implement gfx_converter with gin
* refactor: convert methods of NativeImage to gin
* refactor: add gin_helper::Arguments
* fix: use gin_helper::Arguments to parse multi-type parameters