Dynamic favicon

[kevinpapst]

Description

Added dynamic favicon that changes, when an entry is running

This is especially helpful for pinned tabs:

Needs the "Update browser title" user-preference to be activated.
Does work in Chrome, Brave, Firefox.
Safari always had terrible favicon support and it doesn't work there.

Fixes #3057

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• I verified that my code applies to the guidelines (composer code-check)
• I updated the documentation (see here)
• I agree that this code is used in Kimai (see license)

[codecov]

Codecov Report

Merging #4038 (45e5045) into main (2664d61) will not change coverage.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #4038   +/-   ##
=========================================
  Coverage     89.29%   89.29%           
  Complexity     8442     8442           
=========================================
  Files           765      765           
  Lines         28408    28408           
=========================================
  Hits          25367    25367           
  Misses         3041     3041           

see 2 files with indirect coverage changes