Support for watch flags

Done:
FLAG_WATCH_NONE :sunglasses:
FLAG_WATCH_NEW_POSTS
FLAG_WATCH_NEW_POST_LIKES
FLAG_WATCH_NEW_COMMENTS
FLAG_WATCH_NEW_COMMENT_LIKES
code style + external flags module

code style fixes
flag definitions moved from config to separate watchflags module
Merge pull request #47 from leriel/watch-flags

Wsparcie dla watchFlags