gettor: Use the new per platform json file and add android support

Now there is a file per plaform to provide releases information. Android is also included now in the list of platforms, with commit brings support for android apk's in gettor.

We also fix some issues with macos platform not being recognized after the platform has being renamed (from osx64), and move to use win64 as a default option for windows.

Tor Browser now is multilocale. Clean up all the locale support code and simplify the implementation.

Closes: #42 (closed) #148 (closed) #144 (closed)