Add an option in Combat Simulator to disable the blur effect from melee damage

This effect might be annoyning or eye straining for some people so i believe it's a good idea to implement this option. There is still some free space in the MP Options bitfield for future expansion.

src/include/constants.h

@@ -2890,6 +2890,7 @@
 #define MPOPTION_PAC_HIGHLIGHTTARGET    0x00080000
 #define MPOPTION_PAC_SHOWONRADAR        0x00100000
 #define MPOPTION_SPAWNWITHWEAPON        0x00200000
+#define MPOPTION_NODRUGBLUR             0x00400000
 
 #define MPPAUSEMODE_UNPAUSED 0
 #define MPPAUSEMODE_PAUSED   1