Add joystick deadzone slider to config menu

Closes #634
Remove mouse emulation
Allow continuous use of actionbar powers
Merge pull request #680 from dorkster/actionbar

Allow continuous use of actionbar powers
Merge pull request #679 from dorkster/config

Remove mouse emulation and add a joystick deadzone slider to the config menu
Make WidgetSlot configurable to have continuous activation or not.
Merge pull request #682 from igorko/bugfixes

Make WidgetSlot configurable to have continuous activation or not.