[3rdparty, ajax, lib]: Cleanup and optimize.

This marks as an attempt to optimize ResourceParser:
    - shouldn't parse ALL strings, just ones we're interested in
    - rather than do many and unecessary slow php::read operations,
      skip to end (seekable streams, yay!)
    - likewise, SeekableStream::toMemoryStream would read one byte at a
      time until EOF, which is silly
    - don't parse resourceTypeSpec and friends, probably useless.
Difference: VLC parsing takes ~0.4s versus ~5s.

Furthermore, we're not using: apk extraction, the manifest XML string,
activity list, dedexer, etc. Remove everything.

Also, OTBS ftw.