fix: look at explosion on suicide, fix FF for mine

1. When killing self with a missile, look at the explosion
   instead of looking at the center of the world.
2. Make proximity mines not damage teammates,
   even with `g_friendlyFire 1`.
   This makes sense since proximity mines already don't damage self.

I have checked through all the usages of `inflictor`
inside of `G_Damage`:
- `player_die() -> Team_FragBonuses`: unused.
- `player_die -> LookAtKiller`: used,
  and it's the point of this commit.
- `targ->use`: none of the `use` functions utilize `inflictor`.
- `mod == MOD_PROXIMITY_MINE`: also fixes a bug.

Author: WofWca

code/game/g_combat.c

@@ -1135,7 +1135,7 @@ qboolean CanDamage( gentity_t *targ, vec3_t origin )
 G_RadiusDamage
 ============
 */
-qboolean G_RadiusDamage ( vec3_t origin, gentity_t *attacker, float damage, float radius,
+qboolean G_RadiusDamage ( gentity_t *self, vec3_t origin, gentity_t *attacker, float damage, float radius,
 					 gentity_t *ignore, int mod) {
 	float		points, dist;
 	gentity_t	*ent;
@@ -1192,7 +1192,7 @@ qboolean G_RadiusDamage ( vec3_t origin, gentity_t *attacker, float damage, floa
 			// push the center of mass higher than the origin so players
 			// get knocked into the air more
 			dir[2] += 24;
-			G_Damage (ent, NULL, attacker, dir, origin, (int)points, DAMAGE_RADIUS, mod);
+			G_Damage (ent, self, attacker, dir, origin, (int)points, DAMAGE_RADIUS, mod);
 		}
 	}
 

code/game/g_local.h

@@ -527,7 +527,7 @@ const char *BuildShaderStateConfig( void );
 //
 qboolean CanDamage (gentity_t *targ, vec3_t origin);
 void G_Damage (gentity_t *targ, gentity_t *inflictor, gentity_t *attacker, vec3_t dir, vec3_t point, int damage, int dflags, int mod);
-qboolean G_RadiusDamage (vec3_t origin, gentity_t *attacker, float damage, float radius, gentity_t *ignore, int mod);
+qboolean G_RadiusDamage (gentity_t *self, vec3_t origin, gentity_t *attacker, float damage, float radius, gentity_t *ignore, int mod);
 int G_InvulnerabilityEffect( gentity_t *targ, vec3_t dir, vec3_t point, vec3_t impactpoint, vec3_t bouncedir );
 void body_die( gentity_t *self, gentity_t *inflictor, gentity_t *attacker, int damage, int meansOfDeath );
 void TossClientItems( gentity_t *self );

code/game/g_missile.c

@@ -63,7 +63,7 @@ void G_ExplodeMissile( gentity_t *ent ) {
 
 	// splash damage
 	if ( ent->splashDamage ) {
-		if( G_RadiusDamage( ent->r.currentOrigin, ent->parent, ent->splashDamage, ent->splashRadius, ent
+		if( G_RadiusDamage( ent, ent->r.currentOrigin, ent->parent, ent->splashDamage, ent->splashRadius, ent
 			, ent->splashMethodOfDeath ) ) {
 			g_entities[ent->r.ownerNum].client->accuracy_hits++;
 		}
@@ -409,7 +409,7 @@ void G_MissileImpact( gentity_t *ent, trace_t *trace ) {
 
 	// splash damage (doesn't apply to person directly hit)
 	if ( ent->splashDamage ) {
-		if( G_RadiusDamage( trace->endpos, ent->parent, ent->splashDamage, ent->splashRadius, 
+		if( G_RadiusDamage( ent, trace->endpos, ent->parent, ent->splashDamage, ent->splashRadius, 
 			other, ent->splashMethodOfDeath ) ) {
 			if( !hitClient ) {
 				g_entities[ent->r.ownerNum].client->accuracy_hits++;