feat: Remove all unnecessary install modes

[gabyx]

Fixes: #152.

Two modes::

• The normal mode sets local core.hooksPath on git hooks install in a repository and will not do any automatic installation on clone/init.
• The centralized mode sets this globally and will work by default for all clone/init repos.

More changes:

• Run-wrappers can still be installed in local repos, init.templateDir is not used and controlled by Githooks anymore.

• Run-wrapper will use by default githooks-runner and as fallback use git config githooks.runner. Package manager builds tag: package_manager_enabled will not set this.

• The installer has an option --hooks-dir which specifies the directory to place the maintained hooks.

• The installer has an option --hooks-dir-use-template-dir in non---centralized mode which looks for a set GIT_TEMPLATE_DIR or init.templateDir or the Git default directory. This option is not encouraged, and will install templates on each init/clone as before.

• The installer warns if the chosen hooks dir during install is pointing to a template directory used by Git.

• User wanting to install run-wrappers instead of setting core.hooksPath should either use git hooks install --maintained-hooks or place a file <template-dir>/hooks/githooks-contains-run-wrappers to let Githooks know that this repo maintains run-wrappers (for updates etc, that no core.hooksPath is used but run-wrappers installed directly).

• Registering is now done for all repositories (also in centralized mode).

• git hook uninstall --full and git hooks uninstaller --full-uninstall-from-repos will clean all Git config and cached settings (checksums) in registered repositories, by default git hooks uninstall will not remove locally set githooks.* Git config variables, this is to make reinstallation more easy, e.g. githooks.maintainedHooks stays and will be read on reinstall.

[coveralls]

coverage: 77.882% (-2.3%) from 80.215% when pulling f24599f59b88022345a1b6f6a51f16277c7e1d63 on feature/remove-all-unnecessary-install-modes into 116356a27cabdb23e0b4545788c52117b38e7a87 on main.