update biskitbase docker image to include Hex 8.0

[graik]

A new image needs to be created and uploaded to dockerstore.

• [x] clone biskitbase locally
• [x] download xplor-nih, delphi
• [x] download hex for linux to downloads
• [x] add hex installation to docker script
• [x] rebuild and test dockerbase image
• [x] upload new image to dockerstore

[graik]

currently held up by the need to upgrade delphi wrapper to version Delphi C++ version.

[graik]

Image uploaded. Delphi wrappers need to be adapted but that's another issue (see #35 and #36)