Use tags for every timesheet entry

[infastra]

Description

I added the possibility to allocate tags for every timesheet entry. The timesheet edit form works with an autocomplete function which uses jquery-ui-autocomplete widget. Furthermore I created a database table for this tags.
The filter function in the timesheet table was extended with a form for tag entries.
The using of tags could deactivate in the settings when the option use_tags is pointing on false.
In addition I extended the Rest-API

Fixes #768

TODO

• check enter in toolbar after selecting an entry from the autocomplete (doesn't work when ending with a ",")
• shall we have an admin screen to change tags with typo or delete (deprecated) tags?

Types of changes

• New feature (non-breaking change which adds functionality)

Checklist

• I have executed bin/console kimai:phpcs --fix to make sure my changes adopt the correct code style
• I have added tests to cover my changes
• I agree that this code is used in Kimai and will be published under the MIT license

[kevinpapst]

FYI: I have some more PRs in the pipeline which I will merge first. Your PR might have to wait for the next milestone before being integrated.
I will solve the merge conflicts as soon as I merge the other PRs, as I moved some files around and I don't want you to have the "trouble".

[kevinpapst]

Sorry @infastra this is taking so long. I just merged it with the latest master and will do further testing now and work on integrating it ASAP.

@rarvin as you also requested this feature, can you jump in and do some testing on this branch?

I deployed it to https://demo-branch.kimai.org/en/timesheet/

[kevinpapst]

That was by far the biggest contribution to Kimai so far, thanks again for introducing the initial tags feature @infastra

[infastra]

@kevinpapst Thanks a lot for compliment! I really appreciate that I am part of the project!

[lock]

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