Remove CursorHold/FocusGained autocmds

They were causing an error on launch... maybe they've been taken out,
I'm not sure.  Anyway, I've decided I don't need them.
Switch exctags to ctags

All the computers I now use have it at ctags, so continuing to
point these settings to exctags is ridiculous.
Windows-specific settings

Mostly disabling stuff Windows can't do :-(
Disable italic text in solarized
Set ignore=dirty flag on submodules