[BUGFIX] Local git repositories get no results
[CLEANUP] Removed unnecessary imports

In the source code there are many unused imports.
This commit removes them for a cleaner code base.
[BUGFIX] #9 - Error message wrongly raised: "Invalid extension Weeks"
Resolve extension dependencies recursivly
Added Metrics extension as dependency
Raised word column to 150 and added sql commit
Added commit graph
Merge branch 'feature/file_content' into develop
Merge pull request #38 from andygrunwald/extension-message-words-commit

Make extension MessageWords working again
Merge branch 'feature/file_content' into develop
Indexing parent_id in commit_graph
Merge branch 'feature/file_content' into develop
Merge branch 'feature/commit_graph' into develop
Merge pull request #28 from andygrunwald/invalid-extension-weeks

[BUGFIX] #9 - Error message wrongly raised: "Invalid extension Weeks"
[FEATURE] Add option to list all available extensions
Fixed "KeyError: '__init__'" in extension list command
Merge pull request #27 from andygrunwald/help-list-extensions

[FEATURE] Add option to list all available extensions
Added recurslivly execution of dependencies
Added MessageWords as a dependency for MessageWordsPrint
Fix typo in week extension