Update ftplugin; add session-maps; doc comments.

Add:
	tmux.conf
		-add keymaps for session switching.

	shell_scripts/(termColorsFonts, tmuxBatteryStatus).zsh
		-add file-header documentation comments.

	shell_scripts/dotfilesLink.(sh -> zsh)
		-"convert" to zsh script to leverage shell_scripts/termColorsFonts.zsh
		functionality.

	vim/ftplugin/c.vim
		-add PrintTemplate(), which prints my preferred order of different
		declaration statements in a C file (eg, #include system header, then
		#include local header).

	vim/ftplugin/graphicscript.vim
		-add syntax highlighting for my graphics-engine project's scripting
		language.