Added scrollTrigger, slotName and verbose level

Added a scrollTrigger which controls the number of degrees of rotation
of the scroll command block that will trigger a slot change.
Added a slotName, which is the default name of the slot files (with the
appropriate slot number appended).
Added a verbose level. 0 is the user default, 3 is the current maximum.
Higher means more verbose.
Modified to keep track of project slots

Also added support for output at high verbose levels.
Changed loadProject and saveProject to require the slotNumber as
function parameter.
Further implementation

Implemented the actual scrolling functionality (by considering the
rotation of the physical block, taken from the CameraEvent object).
Implemented functionality that checks whether to open a overwrite
dialogue. Added support for general menu output as well as output at
high verbose levels.
Added output

Added general menu output as well as output for high verbose levels.
Added output

Added general menu output as well as output for high verbose levels.
Also updated function header.
Added output

Added general menu output as well as output for high verbose levels.
Also fixed the handleInput function header and the loadProject call to
sessionManager.
Added output

Added general menu output as well as output for high verbose levels.
Also fixed the handleInput function header.
Added output

Added general menu output as well as output for high verbose levels.
Also fixed the handleInput function header and the saveProject call to
sessionManager.
Changed function header

The SlotChooser menu state requires the CameraEvent associated with a
particular input event (so that the rotation information of the blocks
can be used). Consequently, a handleInput event now takes a CameraEvent
as one of the parameters.
Changed function header.

The SlotChooser menu state requires the CameraEvent associated with a
particular input event (so that the rotation information of the blocks
can be used). Consequently, a handleInput event now takes a CameraEvent
as one of the parameters.
Merge branch 'development' of https://github.com/Threepud/Sketchup-Blocks into development