New module, update your IDEs

Hi all.

I’ve split some code from dhis-support-system into a new module dhis-support-commons. You might have to update your IDE projects because of this.

Also, the new module is intended to be externalizable, meaning no org.hisp.dhis dependencies. It is therefore a good place to put general utility code which can be reused by our android devs, among others. Also, please make sure you do not add any internal dependencies to dhis-support-commons (!).

Ps. Tests for the moved classes remain in support-system for now since we cannot set up test-contexts without dhis dependencies.