Make actors outside map borders selectable for their owner

PR #5967 only made planes not lose their selection when they strayed
outside the map border. This PR makes it possible to select them when
they already are outside the map.  It also ensures that the selection
decorations are drawn.  Rank designations, however, will disappear when
a unit leaves the map.

Fixes #5651 for real, then.
Make aircraft not waste their missiles by firing from outside the map

Fixes #6001.

This obviously affects Yaks as well as Migs, even though Yaks had no
trouble with attacking from outside the map.
Merge pull request #5993 from obrakmann/fix5651_take2

More aircraft/shroud interaction fixes
Fix support power selector revealing cloaked enemy units.

Delete unnecessary using line.

Fix spacing.
Merge pull request #6074 from deniz1a/chrono-curtain-select

Fixes #5166
add Game.AddChatLine to the new Lua API
add a simple test case
Merge pull request #5845 from Mailaender/new-lua-chatline

Added Media.AddChatLine to the new Lua API
new D2K mod logo
Merge pull request #6091 from pchote/fixup-d2k-logo

New D2K mod logo (fixed)