[vim/.vimrc]: Remove RunWithoutTimeout

All mappings should be of the 'noremap' form, so that RunWithoutTimeout
is not really necessary. I'm not sure why I added it in the first place
(perhaps some old version of SmoothScroll wasn't properly noremap'ing,
but I'm not sure).
[vim/.vimrc]: Move filetype associations to separate location
[vim/.vimrc]: Treat xaml as xml
[vim/.vimrc]: Add mappings to insert lines in normal mode
[vim/.vimrc]: Improved (word-wise) <c-y>/<c-e> in insert mode