Updates to distance Coefficients and other fixes

- updated APIversion to 100004
- changed GetDistanceCoefficient function
- changed update frequence from 10ms to 20ms.
- added callback "CustomCompassPins_MapChanged". To register for
callback use:
CALLBACK_MANAGER:RegisterCallback("CustomCompassPins_MapChanged",
function(zone, subzone) end)
Pins drawn for wrong map under certain cases