Allow alignment job to take matches from skeleton into account

[Tobias314]

Description:

• Moves alignment job to separate tab of "AI Tools"
• Adds option to use manual matches from a skeleton for alignment

Steps to test:

• Create some skeleton trees for some sections of a dataset and then start an alignment job via the "AI Tools"

TODOs:

• Updated changelog
• Removed dev-only changes like prints and application.conf edits
• Considered common edge cases

Issues:

• fixes voxelytics issue 3616

[MichaelBuessemeyer]

Thanks for this PR @Tobias314,

I only found minor things. Well done :) The only must change form my side would be the renaming of the skeleton form item. Please see my comment for that.

Additionally I want to double check something with @fm3 :)

Edit: And maybe also the additional check for an empty skeleton tracing. I just managed to submit the job with the check mark set at the new form item, but with an empty skeleton tracing. I'd welcome a error in such a case :)

[MichaelBuessemeyer]

Sorry, @Tobias314 I found another few nitpicky suggestions about variable naming. Afterwards this PR should be good to go :)
Please apply them before merging

[MichaelBuessemeyer]

And could you please increase the width of the buttons presented in the "run a model" view? Due to one item less, there is some free and sad looking white space.

This is how it looks on the master where there is no whitespace:

And this is your branch with white space on the right side where another fourth button should be.