Add support for quests in party

[pacampbell]

• Party list updates with proper progress.
• Track completion of world quests.
• Add a new column to track number of times a quest is completed.
• Treat quest accept as a checkpoint for saving progress.
• Fix issue where shallow copy didn't really shallow copy in the quest structure.
• Fix issue where changing additional members of quest structure on accident.

Migration Scripts

CREATE TABLE IF NOT EXISTS "ddon_priority_quests" (
	"character_common_id"	INTEGER NOT NULL,
	"quest_id"	INTEGER NOT NULL,
	FOREIGN KEY("character_common_id") REFERENCES "ddon_character_common"("character_common_id") ON DELETE CASCADE
);

Add a new column to the ddon_completed_quests called clear_count

"clear_count"	INTEGER NOT NULL DEFAULT 0

Remove primary key constraint from ddon_quest_progress for character_common_id which was added by mistake.

Checklist:

• The project compiles
• The PR targets develop branch