Refactor Git_Wrapper

[Marius786]

class Git_Command

_call _log get_last_error _git_temp_key_file private get_env set_key can_exec_git is_status_working get_version get_ahead_commits get_behind_commits init add_remote_url get_remote_url remove_remote get_remote_tracking_branch get_local_branch fetch_ref get_commit_message get_remote_branches add commit push rm_cached

class Git_Wrapper extends Git_Command

_resolve_merge_conflicts merge_with_accept_mine successfully_merged merge_initial_commit get_local_changes get_uncommited_changes local_status status is_dirty get_last_commits strpos_haystack_array cherry_pick cleanup _git_rrmdir

class Git_Utils

set_gitignore get_gitignore remove_wp_content_from_version_control