Removed debug panel and StdRedirector

[mrvisscher]

Removes the StdRedirector and consequently debug panel from the AB. The StdRedirector was causing thread instability when they were printing, leading to random crashes without any explanation. This is fixed by removing the redirector, which was necessary for the debug panel to function. Because you can also use your regular console window to read debug messages, it is fine to remove the debug panel in my opinion.

Checklist

• [x] Keep pull requests small so they can be easily reviewed.
• [x] Update the documentation, please follow the numpy style guide.
• [ ] Update tests.
• [x] Categorize the PR by setting a good title and adding one of the labels: bug, feature, ui, change, documentation, breaking, ci as they show up in the changelog.
• [ ] Link this PR to related issues by using closing keywords.
• [x] Add a milestone to the PR for the intended release.
• [x] Request a review from another developer.

[coveralls]

coverage: 50.688% (-0.2%) from 50.857% when pulling edea1a56096a975cd7b73c7f2bfda8abfbaba3cd on mrvisscher:remove-debug-panel into cf3b312f9a261ad1f91b10593319e8a19ee645e7 on LCA-ActivityBrowser:master.