More color fixes for railgun

Show other players' railgun color and their firetime state.
Show snapshot client's color on world item models of railgun.
Fix the impact mark using color2 (spiral) rather than color1 (beam).
Credits go to Ensiform and Harekiet for the refire portion.

code/cgame/cg_local.h

@@ -154,6 +154,8 @@ typedef struct {
 	vec3_t			railgunImpact;
 	qboolean		railgunFlash;
 
+	int				railFireTime;
+
 	// machinegun spinning
 	float			barrelAngle;
 	int				barrelTime;
@@ -320,6 +322,9 @@ typedef struct {
 
 	vec3_t			color1;
 	vec3_t			color2;
+	
+	byte c1RGBA[4];
+	byte c2RGBA[4];
 
 	int				score;			// updated by score servercmds
 	int				location;		// location index for team mode