Add wrappers for terminals to make scripts terminal-agnostic

Scripts launching a terminal will now require x-terminal-emulator in the
path. A symlink for it can be created using `select-term.zsh`.

select-term.zsh

@@ -0,0 +1,29 @@
+#!/bin/zsh
+
+zparseopts -D -E p:=install_path -path:=install_path h:=help -help:=help
+
+if [[ $help ]]; then
+	<<-HELP
+	Usage: $0 [opts]
+
+	Installs a wrapper script for the selected terminal under the name
+	"x-terminal-emulator" in path. The wrapper ensures a common interface for
+	setting title, class and passing commands.
+
+	Options:
+	  -p, --path PATH   target directory to install into (defaults to ~/.local/bin)
+	HELP
+	exit 1
+fi
+
+
+if [[ ! $install_path ]]; then
+	install_path=$HOME/.local/bin
+else
+	install_path=${install_path[2]}
+fi
+
+terms=( lib/term-wrapper-* )
+
+selected_term=$(printf "%s\n" ${terms:t} | fzf)
+ln -fsr lib/$selected_term $install_path/x-terminal-emulator