CORE/Scripting: Move Commander Sarannis & Thorngrin the Tender to cpp scripting. Add instance script.

Thanks to Vincent Micheal for the help :)

src/server/game/Scripting/ScriptLoader.cpp

@@ -579,6 +579,9 @@ void AddSC_instance_arcatraz();
 void AddSC_boss_high_botanist_freywinn();    //TK Botanica
 void AddSC_boss_laj();
 void AddSC_boss_warp_splinter();
+void AddSC_boss_thorngrin_the_tender();
+void AddSC_boss_commander_sarannis();
+void AddSC_instance_the_botanica();
 void AddSC_boss_alar();                      //TK The Eye
 void AddSC_boss_kaelthas();
 void AddSC_boss_void_reaver();