Load specific native libraries on desktop/netfx

[mattleibow]

Description of Change

Load specific native libraries on desktop/netfx

This fixes 2 issues:

• loading multiple versions of libSkiaSharp ([FEATURE] Native library name versioning #1252)
• resolving the issue with 32/64 bit dll (Dynamically load 32/64 libSkiaSharp #713)

Works with #1347

Bugs Fixed

• [FEATURE] Native library name versioning #1252
• Dynamically load 32/64 libSkiaSharp #713

API Changes

None.

Behavioral Changes

// TODO

PR Checklist

• Has tests (if omitted, state reason in description)
• Rebased on top of master at time of PR
• Changes adhere to coding standard
• Updated documentation