Qbs: Fix copying of QbsBuildSteps

This should fix quite a few issues with e.g. changing and cloning kits.

Change-Id: Ia3278ff1a5eb1ab4c019dca5806ce7fc691e4d8e
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>
Debugger: Don't limit length of displayed string-ish keys

Any restriction should done on the python side.

Change-Id: I09523aa8a3b0256ec0468416bc823353d5b011ea
Reviewed-by: hjk <hjk121@nokiamail.com>
Debugger: Fix void* lookup regression

Change-Id: I1ddb0defd01021b5f06931cd6f266363ce8787b9
Reviewed-by: hjk <hjk121@nokiamail.com>