Remove ShaperBuffers/OpenTypeLayoutCache and NetFX v3.X dead code

[h3xds1nz]

Description

Removes ShaperBuffers/ShapingOptions/ShaperFeaturesList classes that are pure dead code. Actually unused since netfx4 after swapping in PresentationCore from the old engine (IShaper/IShapingEngine) and PresentationFontCache.

CachedFontFace / CachedFontFamily / FontCacheLogic / CachedCompositeFamily / IPCCacheManager are not included in compilation at all but they were in the repo for no reason, really, since we use DWrite now.

FontCacheConstants were included in the compilation but the class is just full of constants.

FeatureTags are OpenType feature tags that are publicly known and can be retrieved anytime.

Code removed in OpenTypeLayout / OpenTypeCommon cascades by removing one uncalled method after another; OpenTypeLayoutCache is only used by one of these uncalled methods.

Customer Impact

Cleaner codebase for developers.

Regression

No.

Testing

Local build, app run with typography, opentype fonts stuff.

Risk

Low as it is a lot to remove but all is unused dead code.

Microsoft Reviewers: Open in CodeFlow

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 11.23706%. Comparing base (0d19d68) to head (b1d5aa5).
Report is 3 commits behind head on main.

Additional details and impacted files

@@                 Coverage Diff                 @@
##                main      #10664         +/-   ##
===================================================
- Coverage   11.27425%   11.23706%   -0.03720%     
===================================================
  Files           3353        3351          -2     
  Lines         668062      666847       -1215     
  Branches       74980       74821        -159     
===================================================
- Hits           75319       74934        -385     
+ Misses        591489      590667        -822     
+ Partials        1254        1246          -8     

Flag	Coverage Δ
Debug	11.23706% <ø> (-0.03720%)	⬇️

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