fix deobfuscation

- don't use suffix tree in search
- decrease default working threads count (only 1 for background jobs)
- use string refs for store only one code string without duplicates
- use cache for creating UI nodes
- allow to disable autostart for background jobs (decompilation and index)

Enable file drop operation for loading it.

Fix deobfuscator

      for overridden methods, older 'jobf' file must be removed)

set the source file property with wrong value and break deobfuscation)
default: disabled

      (used the same name/path as the APK file, but extension 'jobf')

Make jadx-gui.jar runnable