Add qvim - an experimental Qt gui for Vim

vim-qt has the most complete set of Ctrl-Alt-Meta binding functionality.
For example, qvim is able to correctly bind keys like Alt-<nonlatin>.
More: https://bitbucket.org/equalsraf/vim-qt/wiki/Features
qvim: clean up the code
Merge pull request #1170 from grwlf/qvim

Add qvim - an experimental Qt gui for Vim