Method reset

src/ppu.cpp:172–179

	PPUSTATUS status;

	void reset() {
		fv = v = h = vt = ht = 0;
		fh = par = s = 0;
		_fv = _v = _h = _vt = _ht = 0;
		status.cycle = 0;
		status.end_cycle = 341;
		status.sl = 241;
	}

	void install_latches() {
		fv = _fv;