feat: add support for functional elements (#14)

[holtgrewe]

No description provided.

[codecov]

Codecov Report

Attention: 38 lines in your changes are missing coverage. Please review.

Comparison is base (b96499c) 76.40% compared to head (5d681e5) 75.51%.

Files	Patch %	Lines
src/strucvars/eval/dup/section2.rs	55.55%	20 Missing ⚠️
src/strucvars/eval/del/section1.rs	70.00%	6 Missing ⚠️
src/strucvars/eval/dup/section1.rs	68.42%	6 Missing ⚠️
src/strucvars/eval/mod.rs	82.60%	4 Missing ⚠️
src/strucvars/eval/common.rs	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #18      +/-   ##
==========================================
- Coverage   76.40%   75.51%   -0.89%     
==========================================
  Files          26       26              
  Lines        1695     1789      +94     
==========================================
+ Hits         1295     1351      +56     
- Misses        400      438      +38     

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