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Replace readonly_constant_property decorator

The custom readonly_constant_property decorator was only used within the
Directory class hierarchy. And it no longer seems to warrant its
complexity.

The git_dir readonly_constant_property becomes a regular _get_git_dir()
method. It is only ever called once, at Directory setup time, to ensure
that the command is being run in the context of a git repository.

The __topdir_path readonly_constant_property is removed. The cd_to_topdir()
method now calls `git rev-parse --show-cdup` on its own and changes
directory, if necessary. This potentially saves a superfluous os.chdir()
call.

The is_inside_git_dir readonly_constant_property was unused and is removed.

Signed-off-by: Peter Grayson <pete@jpgrayson.net>

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