Misc updates.
FileTree: more porting te unified.
Expander: improvements.
Xiki.org source.
layout+mark: unified.
FileTree: suggest creating nonexistent files when navigating.
menu_after: pass options proc.
Unified: Key mapping udpates.
Outlog: added yaml and xi formatting.
Unified: switched to new semicolon escaping.
PreFilters: implemented.
Defs > ported to unified.
Misc renames.
Unified: menus.
Xi: early version of xi parsing.
Conf: created generic conf menu system.
Unified: Misc updates.
menu3 dir: old pre-unified menu dir, renamed from 'menu'.
Unified: moved old menus into menu3.
Git: ported to Unified and improved.