New Explosion system code changes.
New explosion system yaml changes.
Fix descriptions.
Streamline isValid check.
Make FMVPlayer in TD use a completely black background

Fixes #6211.
Make FMVPlayer in RA use a completely black background
5936 Advanced Power Plant have a different layout in the original
Merge pull request #6230 from havok13888/AdvancedPowePlant

#5936 Advanced Power Plant have a different layout in the original
Merge pull request #6220 from obrakmann/fix6211

Make background of FMVPlayers in TD and RA black
avoid NullReferenceException in updatedRegion

fixes #6166
Merge pull request #6226 from Mailaender/shroud-updatedregion-nre

Fixed a crash when there are no actors to reveal shroud on the map.
Change ImpactTypes from array to bitfield approach.
Fixes D2k heavy factory roof displaying below exiting units.

Closes #6236.
Fixes D2K AI constantly repairing weather damage.
Fixes incorrect package name in INSTALL.md

No package `libmono-winforms4.0-cil` exists in Debian or Ubuntu. The correct package name is `libmono-system-windows-forms4.0-cil`.
Merge pull request #6256 from jfinkels/patch-1

Fixes incorrect package name in INSTALL.md
Merge pull request #6248 from reaperrr/d2k-roof-fix

Fix D2k heavy factories roof ZOffset
Merge pull request #6250 from UberWaffe/#6149_AIRepair

Closes #6149
Merge pull request #5937 from reaperrr/explosions2

Implements more sophisticated explosion animation/sound system
Experience