monopam: remove redundant function prefixes
Rename functions to remove get_/find_ prefixes:
- verse_registry: find_member -> member, find_members -> members
- verse: get_tracked_handles -> tracked_handles,
get_verse_subtrees -> verse_subtrees
- cross_status: get_subtree_info -> subtree_info
- status: get_subtree_hashes -> subtree_hashes
- forks: get_cached_scan -> cached_scan, get_ref_commit -> ref_commit
- monopam: get_branch -> branch, get_behind -> behind