Add task to rebase an existing SEU to a new location

[lreimer]

Extend the base plugin by a new task ot rebase the SEU to a new directory.

[lreimer]

Sometimes you will have drive letter clashes when using multiple SEUs. We need a new task that will rebase the SEU to a new location. Several changes to existing files are required here:

rebase all links in the SEU root
rebase ENV files under software/
check what IntelliJ or other installations think about being rebases

worst case is we need to reinstall those packages
we will not start to patch application specific files with this task
were do we store the current SEU configuration?

we could also store it in the SEUAC DB
or we could provide the required params for this tasks on the command line