decide which mirror to choose locally and display result

closes #3904
* Fixed Bug #5072: RenderLandingCraft doesn't do an IsInMap check

https://github.com/OpenRA/OpenRA/issues/5072
* Fixed whitespace issue.
Remove support for .NET 3.5 from make.ps1 since we need .NET 4 now
Merge pull request #5177 from ScottNZ/bleed

Remove support for .NET 3.5 from make.ps1 since we need .NET 4 now
Merge pull request #5160 from porzell/bleed

* Fixed Bug #5072: RenderLandingCraft doesn't do an IsInMap check
Make the ready overlay blink. Fixes #3032.
Updated Deterring Democracy map. Now 2p.
Updated Deterring Democracy Plus map
Updated map Dead_in_Motion_redux. Now 2p.
Updated Lessons From Kosovo map
Updated Manufacturing Consent map. Fewer start loc
Renamed slippery_slopes. Added blue tib markers.
Issue #4650: Abort Mission Confirmation

Adapted the confirmation dialog from the CnC mod and wired it to
the "Abort" and "Surrender" buttons.
Updated & renamed no_escapism. added trees.
renamed skull valley. now 4p. bridges fixed.
Adding "pressure" map.
Merge pull request #5178 from pchote/get-blinkin-ready

Make the ready overlay blink.
Add confirmation-dialogs.yaml to d2k's and ts's mod.yaml or they crash
Hide ingame menu before showing the confirmation dialog

As a bonus, don't show the confirmation dialog if the game is over.