The evolution of the demo applications over time has resulted in the accumulation of some cruft and inconsistencies in their recipes.  This issue proposes the following cleanup:

• Remove remaining references to libhomescreen, qlibhomescreen, etc. as appropriate.  Some of this will be driven by related fixes to qmake configuration in the application(s).
• Update RDEPENDS to reflect current agl-service-* binding dependencies (the current lack of which leads to e.g. SPEC-3734).
• Update recipes to follow the OpenEmbedded style guide (https://www.openembedded.org/wiki/Styleguide)
• Update SUMMARY and DESCRIPTION fields to be consistent and drop references to "CES 2017".