Fix TapSurround terminal rendering bug.

Add:
	vim/scripts/TapSurround/plugin/TapSurround.vim
		-`s:CreateKeymaps()` created keymaps using `exe "normal! :"`, which
		prevented Vim from clearing the screen properly on exit. Replace with
		plain `exe ""`.

	vim/tap-surround/*
		-Remove old tap-surround plugin files.