Revamp looking up homepage, issues, merge requests of modules using `axii module open ...`

Closes #198 (closed)

• Revamps axii module open ... to use the new code hoster interface instead in armarx_setup/cli/module/integration.py
  • It didn't work anymore because the integration just checked whether "gitlab" is in the URL, which is not the case anymore
  • It also never worked for GitHub etc
  • It now also even works with deps/vtk for example, which is on a self-hosted GitLab instance
• Adds sanity checks for update.git.* in update step in armarx_setup/core/module/update.py
• Refactors all module definitions to use the new code hoster format instead (all other changed files)