Add cinit, vim filetype textwidth, clean bashrc.

Add:
	shell_scripts/cinit.zsh
		-add shell-script to generate a C project with my typical directory
		structure and files.

	shell_scripts/_cinit/(c, make).tmp
		-add assets directory _cinit/ for cinit.zsh, containing C and makefile
		templates.

	vim/ftplugin/(gitcommit, markdown, plaintex, tex, text)
		-add textwidth=80

	bashrc
		-remove all aliases, variables, functions, etc., with the exception of a
		tmux alias and tmux-session attachment conditional, because my bashrc
		is now only relevant to initializing tmux.