Squashed 'modules/base/features_override/' content from commit 87f3943

git-subtree-dir: modules/base/features_override
git-subtree-split: 87f3943f311a5379e60079871bc56145a16a05b0
New: Add features.override.module.

Merge commit 'f3c4b7b59cd8a40048799015274f74725aee4367' as 'modules/base/features_override'