Proper Update Management

[SillyFreak]

Currently, the Hedgehog bundle allows for the installation of either the latest released version of Hedgehog Software or, in case of the Python parts, the latest development versions from GitHub.

The bundle Makefile should allow for the installation of arbitrary (supported combinations of) released versions of Hedgehog software. The Hedgehog "root" Makefile should support this, and updates to the root Makefile should not impact the installation of different versions. Updates to Bundle Makefiles are not critical, as the correct Bundle revision can be checked out for installation.

The IDE should allow to trigger updates to release versions and show installation progress.