[2984] Implement script support for quests 11919 and 11940.

Based on the original work of @virusav
[2985] Implement script support for quest 11090

Thanks to @grz3s for providing the necessary data
[2986] Fix conflict between quest 8447 and 8733

Thanks to @cala for pointing the issue

Close #94
[2987] Implement script support for quest 10310

Thanks to @ghost and Zharvek for providing the information.
Based on the original work of zlokobni
[2988] Implement script support for quest 11154

Thanks to @Rog360 for providing the information

Close #89
[2989] Implement script support for quest 12652

Thanks to @Rog360 for providing the information

Close #88
[2990] Update commit [2986]

Also add missing comment
[2991] Update and improve script for quest 1249

Fix #85
[2992] Implement script support for quest 11889

Close #77
[2994] Implement script support for quest 10935

Thanks to @Rog360 for providing the data