inline css for html invoices

[kevinpapst]

Description

Allows to save a HTML invoice revision safe, as no external resources are linked.
All styles are inlined now.

Invoice styles were removed from the general "app" css, which could be a potential BC break if somebody relied on it in their own invoice templates.

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 kimai:code-check)
• I updated the documentation (see here)
• I agree that this code is used in Kimai and will be published under the MIT license

[codecov]

Codecov Report

Merging #1526 into master will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master    #1526   +/-   ##
=========================================
  Coverage     92.61%   92.62%           
- Complexity     4351     4356    +5     
=========================================
  Files           421      422    +1     
  Lines         13503    13517   +14     
=========================================
+ Hits          12506    12520   +14     
  Misses          997      997           

Impacted Files	Coverage Δ	Complexity Δ
src/Twig/EncoreExtension.php	100.00% <0.00%> (ø)	5.00% <0.00%> (?%)

[lock]

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