Vimrc cleanup - in clean easy to read sections

Moved appearance settings to plugin/settings/skwp-appearance.vim

vim/plugin/settings/persistent-undo.vim

@@ -0,0 +1,7 @@
+" persistent undos - undo after you re-open the file
+" but this gives warnings under command line vim
+" use only in macvim
+if has('gui_running')
+  set undodir=~/.vim/backups
+  set undofile
+endif