Fix outdated and incoherent versions in various files
Main/Remotion.build <BuildScriptPath> should be Remotion.BuildScript.2.0.0-*
(and always default to it after a release).
Main/Remotion.build <RemotionBuildTasksPath> must be the referenced version.
Some ReleaseProcessScript configurations possibly need to be update to ensure bumping the versions and decreasing them again to their default works correctly.