refactored random subsystem

added compile-time seed support

grid/walk/GridWalkPathControl.h

@@ -23,7 +23,7 @@ private:
 	static constexpr float HEADING_CHANGE_SIGMA = Angle::degToRad(10);
 
 	/** fast random-number-generator */
-	std::minstd_rand gen;
+	RandomGenerator gen;
 
 	/** 0-mean normal distribution */
 	std::normal_distribution<float> headingChangeDist = std::normal_distribution<float>(0.0, HEADING_CHANGE_SIGMA);