Improve Search Functionality

[WaitingIdly]

changes in this PR:

• add the ability to search quest rewards (requested over at [BQU/T] Expanding search from task items into reward items fonnymunkey/BQTweaker#10).
• clear search bar on right click (port of Remember last search term and clear search field on right click GTNewHorizons/BetterQuesting#109).
• remember last search term (also ported from 109).
• set the search menu to be the prior page when looking at quests via the search menu.
• make the text field watermark apply regardless of if the search bar is focused if the search bar is always focused (makes it so the Search... watermark actually displays).
• fix a bug where after searching all quest lines are marked as "active" and thus unclickable due to checking if q.getID() != q.getID() instead of btnListRef.get(i).getStoredValue().getID() != q.getID().