some fixes [multithreading,..]

needed interface changes [new options]
logger for android
wifi-ap-optimization
new test-cases

geo/Angle.h

@@ -56,12 +56,12 @@ public:
 	}
 
 	/** convert degrees to radians */
-	static constexpr float degToRad(const float deg) {
+	static constexpr inline float degToRad(const float deg) {
 		return deg / 180.0f * M_PI;
 	}
 
 	/** convert radians to degrees */
-	static float radToDeg(const float rad) {
+	static constexpr inline float radToDeg(const float rad) {
 		return rad * 180.0f / M_PI;
 	}