May Improvements

[phschaad]

• [x] Include the new (optional) vertical state layout
• [x] provide buttons to navigate to an edge's start / end (companion to https://github.com/spcl/dace-webclient/pull/103)
• [x] Add Snitch to the default schedule library (see https://github.com/spcl/dace-webclient/pull/103)
• [x] provide a fallback to show the raw schedule names if schedules are not found in the integrated library (see https://github.com/spcl/dace-webclient/pull/103)
• [x] performance: reduce lag when modifications to the graph or its folding structure occur (collapsing/expanding, editing labels or schedules, etc.)
• [x] Initial editor for compressed SDFG files (.sdfgz), offering noticeable speedup in working with large SDFGs.
• [x] Add a visual interface to the DaCe backend for simpler interaction if things go wrong.

[phschaad]

Already requesting review, even though there will be minor bugfix changes still coming. But due to the PR size I want to give reviews a head start