[Commands] Add #clearxtargets Command (#3833)

# Perl
- Add `$client->ClearXTargets()`.

# Lua
- Add `client:ClearXTargets()`.

# Notes
- Add `#clearxtargets` command for players.
- Allows operators/players to clear their XTargets if something get stuck on it.

common/ptimer.h

@@ -44,9 +44,10 @@ enum : int {	//values for pTimerType
 	pTimerBeggingPickPocket = 27,
 	pTimerLinkedSpellReuseStart = 28,
 	pTimerLinkedSpellReuseEnd = 48,
+	pTimerClearXTarget = 50,
+
+	pTimerShieldAbility = 86,
 
-	pTimerShieldAbility = 86,	
-	
 	pTimerLayHands = 87,		//these IDs are used by client too
 	pTimerHarmTouch = 89,		//so dont change them
 

common/ruletypes.h

@@ -216,6 +216,7 @@ RULE_BOOL(Character, EnableRaidMemberEXPModifier, true, "Enable or disable the r
 RULE_BOOL(Character, LeaveCursorMoneyOnCorpse, false, "Enable or disable leaving cursor money on player corpses")
 RULE_BOOL(Character, ItemExtraSkillDamageCalcAsPercent, false, "If enabled, apply Item Extra Skill Damage as Percentage-based modifiers")
 RULE_BOOL(Character, UseForageCommonFood, true, "If enabled, use the common foods specified in the code.")
+RULE_INT(Character, ClearXTargetDelay, 10, "Seconds between uses of the #clearxtargets command (Set to 0 to disable)")
 RULE_CATEGORY_END()
 
 RULE_CATEGORY(Mercs)