Since there is no API for localization in Safari, we read the locale files
every time when an extension page opens.
This commit adds a new file "make-locale-safari.py", which will make the
size of the locale files smaller.
- Remove duplicate platform specific (from src/) and other unnecessary
files
- Fix and update vapi-*.js files for Safari
- Add tools/make-safari.sh
- Move js/vapi-appinfo.js to meta/ (so, every vendor specific file will be
at the same location)