Add new tap_surround prototype.

Add:
	vim/scripts/tap_surround.vim
		-Add new version of the `tap_surround` script.

Rem:
	vim/bundle/tap-surround
		-Remove symlink to the old `tap-surround` plugin.

	vim/scripts/c_doxygen_comment.py
		-Remove the old Doxygen comment generation script, as it's been replaced
		by the pure Vimscript `doxygen_utility.vim`.
Improve tap_surround.vim delimiter deletion.

Add:
	vim/scripts/tap_surround.vim
		-Add function documentation comments wherever they were absent.
		-Entirely reimplement `NormalDeleteElementPair()`: new version scans
		only the current line, and implements its own parsing function (which
		accounts for escaped delimiters of all kinds). Currently not
		fully-functional.