left mouse button is pressed and released on the item (should fix problems
with accidentally selecting an item). Also added 'Escape' key to mean
"cancel/remove context menu".
Updated '-help' commandline argument to recent additions.
Huge amount of work on the documentation. It's probably not complete,
but it's turning into a project in itself.
git-svn-id: svn://svn.code.sf.net/p/stella/code/trunk@776 8b62c5a3-ac7e-4cc8-8f21-d9a121418aba
stephena