Network upgrade and new reconnection mode:
* users can disconnect or close app without game progress loose now;
* disconnect dialog will show active tables stats and additional options;
* all active tables will be restored on reconnect (tables, tourneys, games, drafts, sideboarding, constructing);
* user must use same server and username on next connection;
* there are few minutes for reconnect until server kick off a disconnected player from all player's tables (concede/loose);
* now you can safety reconnect after IP change (after proxy/vpn/wifi/router restart);
Other improvements and fixes:
* gui: main menu - improved switch panel button, added stats about current tables/panels;
* gui: improved data sync and updates (fixes many use cases with empty battlefield, not started games/drafts/tourneys, not updatable drafts, etc);
* gui: improved stability on game updates (fixes some random errors related to wrong threads);
* server: fixed miss messages about player's disconnection problems for other players in the chat;
* refactor: simplified and improved connection and network related code, deleted outdated code, added docs;
* tests: improved load test to support lands only set for more stable performance/network testing (set TEST_AI_RANDOM_DECK_SETS = PELP and run test_TwoAIPlayGame_Multiple);
* This change's purpose is to get rid of the extra borders shown around the window border. These arise from using JInternalFrames in a JDestopPane and are impossible to remove in a forwards compatible way when using JInternalFrames. The solution it to move to have MagePane inherit from a plain old JLayeredPane instead of JInternalFrame. All of the MagePanes are always maximized anyways, so this doesn't lose any functionality.
