Introduce Profiles to store sets of values that describe a system/device.

These profiles are held by a target, getting rid of much of the information
stored in the Build-/Run-/DeployConfigurations, greatly simplifying those.

This is a squash of the wip/profile branch which has been on gerrit for a
while, rebased to current master.

Change-Id: I25956c8dd4d1962b2134bfaa8a8076ae3909460f
Reviewed-by: Daniel Teske <daniel.teske@nokia.com>