IFM text editor support

The contrib directory of the IFM source distribution has a couple of files which support two popular text editors:

ifm-mode.el

An IFM editing mode for GNU Emacs, which has:

• Syntax highlighting
• An Index menu showing rooms, items, tasks and tags
• A command to display PostScript maps in an appropriate viewer
• Commands to show items and task lists in another window
• Support for Flymake

ifm.vim

IFM syntax highlighting for VIM (Vi IMproved).