added json, xml and txt invoice renderer

[kevinpapst]

Description

to be used with applications and/or scripts

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 #1576 into master will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master    #1576      +/-   ##
============================================
+ Coverage     92.00%   92.03%   +0.02%     
- Complexity     4659     4673      +14     
============================================
  Files           433      436       +3     
  Lines         14385    14435      +50     
============================================
+ Hits          13235    13285      +50     
  Misses         1150     1150              

Impacted Files	Coverage Δ	Complexity Δ
src/Form/Type/LanguageType.php	100.00% <100.00%> (ø)	5.00 <0.00> (ø)
...ce/NumberGenerator/ConfigurableNumberGenerator.php	98.27% <100.00%> (ø)	18.00 <0.00> (ø)
src/Invoice/Renderer/JsonRenderer.php	100.00% <100.00%> (ø)	3.00 <3.00> (?)
src/Invoice/Renderer/TextRenderer.php	100.00% <100.00%> (ø)	3.00 <3.00> (?)
src/Invoice/Renderer/XmlRenderer.php	100.00% <100.00%> (ø)	3.00 <3.00> (?)
src/Twig/Extensions.php	98.82% <100.00%> (+0.15%)	33.00 <5.00> (+5.00)

[lock]

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