An unusual big commit, unfortunately needed because none of these changes would make sense nor work individual. A quick list of what have been done follows.
* Introduced a control panel to control buttons replacing the FAB bar
* `ConfigurableButton` and `OnScreenConfiguration` interfaces have been introduced to allow for easier proxying of actions when applying the same changes to all buttons
* Button resize logic has been stripped from the buttons in favor of the new sliders
* General cleanup and renaming of various methods to better reflect their functionality
The activity adds the following functionalities:
* Lists installed drivers
* Allows the user to install new drivers, or remove installed ones
* Allows the user to select the driver that will be used by the emulator
