Change Store into a MutableMapping.
Change Store key deletion into a transaction.
Send data to audio engine through Store.
Resolve installation prefix.
Create Share object with a proper path to share directory.
Load example instrument as a default action at startup.
Lower example instrument force.
Simplify some code.
Clean up.
Merge pull request #130 from kagu/storestore

Default instrument
make main window smaller
make event list window bigger
Merge pull request #134 from cyberixae/fix_window_sizes

Fix window sizes