Merge from syntheticmagus/BabylonNative#7

Merged

syntheticmagus merged 9 commits into

BabylonJS:masterfrom

syntheticmagus:master

Jun 17, 2019

Commits on Jun 11, 2019

Update README.md and fix Visual Studio 2019 build
bghgary
committed

Commits on Jun 12, 2019

Fixed BgfxEngine::Impl::Clear() to use sane default values if certain arguments are undefined (which is allowed by the contract.
syntheticmagus
committed

Commits on Jun 13, 2019

Commits on Jun 17, 2019

Merge README changes from source repo.
syntheticmagus
committed