Add Maps tab and move to map manager to there

[abraker95]

A change in how maps will be handled.

It's a pain to keep more than 3 tabs open due to long tab names, and if they are shortened, it's hard to know which tab is which map. So like the Replays tab, the Maps tab will have a list of loaded maps for which the player use to toggle the display of. Adding map to display adds a tab, Removing map from display removes the tab.

Consider having two views: Flat view which lists all maps, and Grouped view which shows and allows grouping maps like layers.

Search functionality might be needed

This is also a prerequisite for allowing mass map analysis