[Quest API] Add GetLDoNThemeName() to Perl/Lua. (#1861)

* [Quest API] Add GetLDoNThemeName() to Perl/Lua.
- Add quest::getldonthemename(theme_id) to Perl.
- Add eq.get_ldon_theme_name(theme_id) to Lua.

* Update embparser_api.cpp

zone/questmgr.h

@@ -115,6 +115,7 @@ public:
 	std::string getracename(uint16 race_id);
 	std::string getspellname(uint32 spell_id);
 	std::string getskillname(int skill_id);
+	std::string getldonthemename(uint32 theme_id);
 	std::string getfactionname(int faction_id);
 	std::string getlanguagename(int language_id);
 	std::string getbodytypename(uint32 bodytype_id);