Quest system improvements

[kenedos]

This PR improves on existing custom quest system:

• Adds new TimedActions to facilitate creation of collection quests
• Adds quest DropModifiers, to facilitate creation of quests that allow monsters to drop specific quest items
• Adds 'SetLocation()', 'AddQuestGiver()' for better player quest tracking (displays which NPC gave the quest in what map)
• Objectives display monster names underneath collection tasks (shows which monsters drop the required items)
• Fixes some quest system UI elements, such as text partially cropping off, flickering of quest chase when dashing

This PR also includes two new test scripts:

• c_klaipe_quests.cs
• f_siauliai_west_quests.cs

These quest scripts contain the newly implemented different quest types (collection quests, quest item quests, previously implemented 'kill' quests, etc).