Add support for the PCG32 PRNG algo (and associated script APIs)

src/script/scripting_game.cpp

@@ -92,6 +92,7 @@ void GameScripting::InitializeModApi(lua_State *L, int top)
 	LuaPerlinNoise::Register(L);
 	LuaPerlinNoiseMap::Register(L);
 	LuaPseudoRandom::Register(L);
+	LuaPcgRandom::Register(L);
 	LuaVoxelManip::Register(L);
 	NodeMetaRef::Register(L);
 	NodeTimerRef::Register(L);