Add valgrind-suppression file ftplugins.

Add:
	vim/(bundle/valgrind-suppression-syntax, ftplugin/supp.vim)
		-Add plugin with syntax rules for Valgrind suppression files.
		-Add own syntax matches/highlight rules.

	vimrc
		-Reorganize `augroup miscellaneous`, by grouping autocommands by
		event-type.