Move cache location methods so they are available in all builds

Add --clear-cache option

Signed-off-by: Patrick José Pereira <patrickelectric@gmail.com>

Remove zip experiment.

down bin file to pixhawk fail,because it do not set value for _binFilename in _binLoad

Verify was failing due to incorrect READ_MULTI max size

Verify is still failing though

Usability plus, new features:
- 3DR Radio support
- APM Stack support