More reliable binary builds auto managment implementation.

Signed-off-by: Daniel (dmilith) Dettlaff <dmilith@verknowsys.com>
Defined CACHE/binbuilds/ cache. Renamed confusing name. Defined BINBUILDS_CACHE_DIR global.

Signed-off-by: Daniel (dmilith) Dettlaff <dmilith@verknowsys.com>