[Quest API] Add HTML color tag method to Perl and Lua. (#1324)

* Add HTML color tag method to Perl and Lua.
- Add quest::gethexcolorcode(color_name) to Perl.
- Add eq.get_hex_color_code(color_name) to Lua.

Full color list here: https://pastebin.com/rUYKr1ye

* Convert to static and use strcasecmp over strcmp.

Co-authored-by: Chris Miles <akkadius1@gmail.com>

zone/questmgr.h

@@ -373,6 +373,7 @@ public:
 	void ClearNPCTypeCache(int npctype_id);
 	void ReloadZoneStaticData();
 	std::string secondstotime(int duration);
+	std::string gethexcolorcode(std::string color_name);
 
 	Client *GetInitiator() const;
 	NPC *GetNPC() const;