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don't spit errors if directories to be cleaned are missing

closes #5126
added a new hotkey to trigger pixel doubling

closes #5122
Added a ^BaseBuilding default that Inherits ^Building to CnC mod.
Moved some traits, including MustBeDestroyed, from ^Building to ^BaseBuilding.

Removed some now superflous traits and trait negations from ^CivBuilding.

Changed Inheritances of all buildable structures to ^BaseBuilding.
moved CHANGELOG into GitHub wiki
fixed packaging regressions from upgrade to SDL 2.0.3

followup of #5073
fixed a packaging regression during the GeoIP2 update

followup of #4666
add crane animation to Dune 2000 and Tiberian Sun

closes #3754
Update README.md

PNG → SVG
don't rotate the radar dish when it is powered down

closes #3755
Merge pull request #5150 from Mailaender/mv-changelog-wiki

Moved CHANGELOG into GitHub wiki
Merge pull request #5142 from Mailaender/pixeldouble-hotkey

Added a new hotkey to trigger pixel doubling
Merge pull request #5146 from reaperrr/mbd-fix

Removed MustBeDestroyed from CnC Civ/Tech buildings
Merge pull request #5124 from Mailaender/crane-overlay

Added crane build animation to construction yards in Dune 2000 and Tiberian Sun
allow animations to pause on low power

closes #2949
stop spinning the radar dishes in Tiberian Sun on low power
Merge pull request #5128 from Mailaender/force-clean

Don't spit errors if directories to be cleaned are missing
only add bots when the map allows it

fixes #5110
Merge pull request #5138 from Mailaender/disable-idle-overlay

Fixed the Dune 2000 outpost radar dish rotating when powered down
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