simple script for xfce4 launcher to raise or start an application

Uses xdotool to raise the window, if that fails, run the program,
rather than starting a new instance.  Useful for programs like
Conlecterm, EMCAS, Firefox... where only one instance multi-tab
program is used.

The --search=<S> specifies options passed to "xdotool search <S> windowactivate'

e.g. (for PC-BSD) replace the launcher command eith:

ActivateOrRun --search='--name terminal' conlecterm
ActivateOrRun --search='--name emacs@' emacs %F
ActivateOrRun --search='--classname navigator' /usr/pbi/firefox-amd64/.sbin/firefox %U
ActivateOrRun --search='--name .*-[[:space:]]Chromium$' /usr/pbi/chromium-amd64/.sbin/chrome %U

Signed-off-by: Christopher Hall <hsw@ms2.hinet.net>