Restore CM_SNAPSHOT option and always keep CM_EXTRAVERSION

Conflicts:
	config/common.mk
Add hh:mm to CM_VERSION for non-release builds

Conflicts:

	config/common.mk
Remove CM_BUILDTYPE from CM_VERSION for non-release builds

Conflicts:

	config/common.mk
Remove CMUpdater

Conflicts:

	config/common.mk

Conflicts:
	config/common.mk