[Zones] Add Max Level Check to Zones. (#2714)

* [Zones] Add Max Level Check to Zones.

# Perl
- Add `$client->CanEnterZone(zone_short_name)`.
- Add `$client->CanEnterZone(zone_short_name, instance_version)`.

# Lua
- Add `client:CanEnterZone(zone_short_name)`.
- Add `client:CanEnterZone(zone_short_name, instance_version)`.

# Notes
- Allows operators to limit zones to a maximum level.
- Allows operators to see if a player can enter a zone before sending them.
- Keeps players from entering via `#peqzone` and `#zone` as well if they do not meet the requirements or are not high enough status to bypass the requirements.

* Cleanup.

common/eq_constants.h

@@ -684,14 +684,6 @@ namespace Zones {
 	constexpr uint16 APPRENTICE = 999; // Designer Apprentice
 }
 
-//ZoneChange_Struct->success values
-#define ZONE_ERROR_NOMSG 0
-#define ZONE_ERROR_NOTREADY -1
-#define ZONE_ERROR_VALIDPC -2
-#define ZONE_ERROR_STORYZONE -3
-#define ZONE_ERROR_NOEXPANSION -6
-#define ZONE_ERROR_NOEXPERIENCE -7
-
 
 typedef enum {
 	FilterNone = 0,
@@ -1023,4 +1015,15 @@ enum Anonymity : uint8
 	Roleplaying
 };
 
+enum ZoningMessage : int8
+{
+	ZoneNoMessage = 0,
+	ZoneSuccess = 1,
+	ZoneNotReady = -1,
+	ZoneValidPC = -2,
+	ZoneStoryZone = -3,
+	ZoneNoExpansion = -6,
+	ZoneNoExperience = -7
+};
+
 #endif /*COMMON_EQ_CONSTANTS_H*/