Add filter by file names

[uhafner]

Add filtering of the tree by files. To get the counter right all values that are stored on container nodes have been removed. They can be computed on the fly by aggregating the children values.

[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (33bafc0) 95.89% compared to head (3358d20) 95.52%.

Files	Patch %	Lines
...edu/hm/hafner/coverage/parser/CoberturaParser.java	88.23%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main      #52      +/-   ##
============================================
- Coverage     95.89%   95.52%   -0.38%     
- Complexity      612      621       +9     
============================================
  Files            23       23              
  Lines          1486     1497      +11     
  Branches        207      209       +2     
============================================
+ Hits           1425     1430       +5     
- Misses           34       38       +4     
- Partials         27       29       +2     

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