pyic_view.py: Some bug fixes with depth dimensions and slider to also allow plotting atmosphere and ice variables.

pyicon_tb.py: Use flattened array in interp_ckdtree_xr (as was done until some commits before) to avoid dask issues.

pyic_view.py and setup.py: Initial commit for the tool pyic_view that opens a GUI for browsing through ICON data.

qp_driver.py: Changed back to gname=0.3 since gname=0.30 breaks with most of the grids. Those that were created for gname=0.30 were created to get gname=0.3.

Added a link called ci/requirements_latest.yml that should always point to the latest requirements file in the ci directory.

Moved pyic_fig.py, pyic_sec.py, pyic_anim.py and pyic_intake.py to scripts and added __init__.py to fix issue with executable scripts from pip installation.