FIX: don't load everything on resume.
FIX: wrong locking
Trying to make preview and email sending. #1.
Preview is working.
FIX: image loading will show progress dialog.
FIX: minor fixes.
FEATURE: When possible GLContext would be preserved.
FIX: onResume() handled validly if glcontext lost.
FIX: add alpha to background
Reworking search engine.
Moving off RXJava. Usage of AsyncTasks is much better here. Simpler and safer code for sure.

It's necessary to make caching facility, probably ContentProvider should help here.