Update to YC Key Compare (MiSTer-devel#836)

- Add an expanded key option to include core pixel freq in key E.g. Corename_FPS_Fpix=PhaseInc
- Fixes issue with matching YC key when Saturn core changes from low res to high res mode, as the FPS remains the same when the pixel clocks change (E.g. 6.71Mhz vs 7.16Mhz)
- Tested with existing yc.txt list as well as new Saturn keys for yc.txt

video.cpp

@@ -2741,6 +2741,9 @@ static void set_yc_mode()
 		int pal = fps < 55.f;
 		double CLK_REF = (pal || (cfg.ntsc_mode == 1)) ? 4.43361875f : (cfg.ntsc_mode == 2) ? 3.575611f : 3.579545f;
 		double CLK_VIDEO = current_video_info.ctime * 100.f / current_video_info.ptime;
+
+		float prate = current_video_info.width * 100.f;
+		prate /= current_video_info.ptime;
 
 		int64_t PHASE_INC = ((int64_t)((CLK_REF / CLK_VIDEO) * 1099511627776LL)) & 0xFFFFFFFFFFLL;
 
@@ -2749,12 +2752,14 @@ static void set_yc_mode()
 		int COLORBURST_RANGE = (COLORBURST_START << 10) | COLORBURST_END;
 
 		char yc_key[64];
+		char yc_key_expand[64];
 		sprintf(yc_key, "%s_%.1f%s%s", user_io_get_core_name(1), fps, current_video_info.interlaced ? "i" : "", (pal || !cfg.ntsc_mode) ? "" : (cfg.ntsc_mode == 1) ? "s" : "m");
+		snprintf(yc_key_expand, sizeof(yc_key_expand), "%s_%.2f", yc_key, prate);
 		printf("Calculated YC parameters for '%s': %s PHASE_INC=%lld, COLORBURST_START=%d, COLORBURST_END=%d\n", yc_key, pal ? "PAL" : (cfg.ntsc_mode == 1) ? "PAL60" : (cfg.ntsc_mode == 2) ? "PAL-M" : "NTSC", PHASE_INC, COLORBURST_START, COLORBURST_END);
 
 		for (uint i = 0; i < sizeof(yc_modes) / sizeof(yc_modes[0]); i++)
 		{
-			if (!strcasecmp(yc_modes[i].key, yc_key))
+		if (!strcasecmp(yc_modes[i].key, yc_key) || !strcasecmp(yc_modes[i].key, yc_key_expand))
 			{
 				printf("Override YC PHASE_INC with value: %lld\n", yc_modes[i].phase_inc);
 				PHASE_INC = yc_modes[i].phase_inc;