v120.0 beta5 release

New to this release:

• Rudimentary support (TextBlob::MakeFromShapedText) of text-shaping via
  upstream's libSkShaper module. (#195)

• Option to use freetype as fontmgr on non-linux (#213) - using
  skia.FontMgr.New_Custom_Empty()

• OT-SVG font support is on by default now (#212, also see #195).

• Vulkan is enabled for Linux/Windows.

What's Changed

• M120 public by @HinTak in #210

Details in README.m120

Full Changelog: v119.0b4...v120.0b5