* naderman/feature/extension-manager: (67 commits)
[feature/extension-manager] Removing now unused acp_search code
[feature/extension-manager] Split disabling extensions up into steps as well
[feature/extension-manager] Add documentation on caching in ext finder
[feature/extension-manager] Reference correct new module basenames in install
[feature/extension-manager] Rename default methods to core methods on finder.
[feature/extension-manager] Document what the class loader stores in cache
[feature/extension-manager] Add docblock to cached paths map in class loader
[feature/extension-manager] Clear up docs of extension related template changes
[feature/extension-manager] Use "core files" instead of "global files" in docs
[feature/extension-manager] Add docblocks to new search backend methods
[feature/extension-manager] Add docblocks to new methods in functions_module
[feature/extension-manager] Clarify comment on ext meta class instantiator
[feature/extension-manager] Add more info on suffixes in extension finder
[feature/extension-manager] Clarify is_dir parameter description
[feature/extension-manager] Clarify class finding method docblock
[feature/extension-manager] Correct default path comment & remove double strlen
[feature/extension-manager] Fix "disbale" typo in comment
[feature/extension-manager] Properly remove old ACP language loading code
[feature/extension-manager] Support extensions in subdirectories of ext/
[feature/extension-manager] Add prefix to extension meta data / install classes
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