Fixed PrecisionMode action

Fixed PrecisionMode action so that it keeps the input guage colors
updated when changing.
Made camera rotation work in Map mode
Added PrecisionMode dampener for pitch/yaw/roll

Added an option to ModSettings that dampens pitch/yaw/roll input by a
factor if PrecisionMode is active
Added IVANextCamera DiscreteAction

IVANextCamera cycles through kerbals in IVA mode
Made camera rotation work in IVA mode

Still not perfect. Has to update rotation every frame to prevent Squad
from overwriting it. Also has compatibility problems with KerbQuake and
KerbTrack. Make optional in Mod Configurations?
Small cleanup in IVA rotation code
Implemented persistence for mod configuration

Mod configuration was not being saved at all. Switched to
PluginConfiguration instead of ConfigNode.
Added isEnabled property to ControllerConfiguration

Makes it easier to temporarily disable a controller without losing all
of its configuration data.
Refactored camera controls into CameraController

Also improved the way IVA camera control was done. No longer takes
exclusive control of camera and is compatible with all other camera
mods.
Merge pull request #16 from ddaf/master

Fixed PrecisionMode support. Added camera rotation support for Map and IVA modes