glob ptz scripts under control folder

Previously, in order to add a new ptz control script to the zoneminder source tree, one had to perform these steps:  
- Copy new script into the Control folder
- Add new record to zm_create.sql.in
- Update autotools makefile.am
- Update perl Makefile.PL

This pull request eliminates the last two steps by globbing everything under the Control folder.  Note that the INSTALL.SKIP file was added to prevent the *.pm.in files from being installed.