merge cmake osx sdk changes

allow specifying a different CMAKE_OSX_SYSROOT

Oops, fix message

I'd meant for this to match the frontend

- Utility script for parameters handling - Add varying gravity to Gravity script

fix git hash reporting

Only emit roomNameUpdated when it actually is changed

have revinfo also try to pick up git hashes

Prepend '!' to 42nd scheme parameter in network traffic

Fixed commit 887b9eca023c94c26daf9607c7ac9b18172c634d

Special script parameter variable in game scheme

Fixed avwrapper exit calls, fixing issue #752

Try to keep old weapon sets (not tested at all)

Fixed fPIC link failure with arm and sparc architectures, fixing issue #757 Added TargetArch.cmake, from https://github.com/petroules/solar-cmake/blob/master/TargetArch.cmake

Don't set gravity to normal immediately on turn end, let watchdog do its job if game gets frozen