0.4.0

There has been major refactoring and changes since 0.2.0.
The code is still messy, but it can at least be worked upon now.
There are now configuration files for general settings, custom keymapping and mimetype app launching.
Sorting code is settling down.

Some TODOs still:

• add more commands/finish implementing existing commands
• Ctrl/Alt not working
• add panels to UI for composite keybindings