[vim] Move vim config files to vim directory

Vim now also supports XDG_CONFIG_HOME for its config files. So use that.

vim/gvimrc

@@ -0,0 +1,19 @@
+" List mode on here because the GUI has more color possibilities.
+set nolist
+
+if has('win32') || has('win64') || has('win32unix')
+    set guifont=Inconsolata:h18
+elseif has('mac')
+    try
+        set guifont=Source\ Code\ Pro\ Light:h13
+    catch
+        set guifont=Menlo:h11
+    endtry
+elseif has('linux')
+    set guifont=Inconsolata\ 14
+endif
+
+set guioptions-=T       " turn off toolbar
+set guioptions-=m       " turn off menubar
+
+call togglebg#map("<F10>")