Restore and reorganise style parameters

[ntadej]

Restore and reorganise style parameters:

• Completely refactor how style parameters are done as upstream Qt does not have support anymore. While inspired by the original Qt implementation they are written from scratch and split by type.
• They are part of the core library so that widgets can (eventually) also use them.
• src/location/style_change_utils.cpp is pre-existing code from now deleted src/location/stylechange.cpp, just slightly cleaned-up.
• Tests are added both for tile and image sources, including some opacity change. They will be extended in the future.

[codecov]

Codecov Report

Attention: 372 lines in your changes are missing coverage. Please review.

Comparison is base (3334dc3) 35.88% compared to head (0bcfcc6) 45.66%.

❗ Current head 0bcfcc6 differs from pull request most recent head d2dd3e1. Consider uploading reports for the commit d2dd3e1 to get more accurate results

Files	Patch %	Lines
src/location/style_change_utils.cpp	0.00%	171 Missing ⚠️
src/core/style/layer_style_change.cpp	56.19%	46 Missing ⚠️
src/location/qgeomap.cpp	48.71%	40 Missing ⚠️
src/core/style/source_style_change.cpp	57.40%	23 Missing ⚠️
src/core/map.cpp	31.25%	22 Missing ⚠️
src/core/style/style_parameter.cpp	50.00%	15 Missing ⚠️
src/location/plugins/declarative_style.cpp	72.22%	15 Missing ⚠️
src/core/style/style_change.cpp	58.82%	14 Missing ⚠️
src/core/style/image_style_change.cpp	0.00%	13 Missing ⚠️
src/core/style/layer_parameter.cpp	72.41%	8 Missing ⚠️
... and 2 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #69      +/-   ##
==========================================
+ Coverage   35.88%   45.66%   +9.77%     
==========================================
  Files          25       39      +14     
  Lines        1839     2190     +351     
==========================================
+ Hits          660     1000     +340     
- Misses       1179     1190      +11     

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