Parse communication object numbers of modules from allocators

[farmio]

• Parse Allocators and ModuleDef argument Allocates
• Move data merging from xml loader to dataclass method
• Parse communication object numbers from allocators (as fallback if not set as ObjNumberBase argument value)

fixes #361

[codecov]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (f3dea8a) 97.51% compared to head (d53ba88) 97.34%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #362      +/-   ##
==========================================
- Coverage   97.51%   97.34%   -0.18%     
==========================================
  Files          22       22              
  Lines        1087     1129      +42     
==========================================
+ Hits         1060     1099      +39     
- Misses         27       30       +3     

Files	Coverage Δ
xknxproject/loader/application_program_loader.py	100.00% <100.00%> (+1.12%)	⬆️
xknxproject/models/__init__.py	100.00% <ø> (ø)
xknxproject/models/models.py	97.56% <95.91%> (-0.35%)	⬇️
xknxproject/xml/parser.py	93.33% <71.42%> (-1.45%)	⬇️