Beta 1.4

Merge pull request #15 from boriel-basic/features/zxgraphics

Features/zxgraphics

Merge pull request #16 from boriel-basic/features/zxgraphics

Features/zxgraphics

Merge pull request #4 from boriel-basic/features/zxgraphics

ZXGraphics improvments

Merge pull request #1 from boriel-basic/Net8

Update to .Net8