added configurable action groups for spoilers and flaps deployment
Different control surface deflection speeds for stick inputs and flap/spoilers. Additional time constant
needs to be tuned somewhat and made configurable.
Merge pull request #13 from DaMichel/ag-configuration

LGTM
Merge pull request #14 from DaMichel/slow-flaps

LGTM
More README stuff, some FAR help changes