cmake: don't enforce that the name of an addon's repository must be identical to the addon identifier
[binary addons] add screensavers.rsxs
remove rsxs from tree
[binary addons] add visualizations fishbmc, goom, projectm, spectrum, waveform
remove visualizations fishbmc, goom, projectm, spectrum, waveform from tree
[depends] use central include file for binary-addons build