Merged in cbillington/runmanager/word_wrap (pull request labscript-suite#35)

Word-wrapping in treeviews and item views, adapted from David Meyer's implementation.

Approved-by: Russell Anderson <russrussruss@gmail.com>
Approved-by: Lars Kohfahl <lars.kohfahl@physik.tu-darmstadt.de>
Approved-by: David Meyer <dihm.meyer@gmail.com>

Author: chrisjbillington