Search for Power Button Panel

Finally, a "search for power button" panel has been added to Pierogi.
Probably still needs some tweaking.  Also, a new Camera Shutter panel
for DSLR camera remotes.  First pass at keysets for Deutsche Telekom,
Emtec, Goodmans, Nikon, Olympus, and Pentax; Canon keyset updated to
use new camera panel.