canvas

Refactor font decorations; rename Text.RenderAsPath to Text.RenderTo; add Text.RenderDecorationsAs instead of Text.WalkDecorations; add FontStroke decoration

Add Matrix functions: IsIdentity, HasTranslation, HasScaling, IsRotation, HasRotation; change IsTranslation to exlude zero-translations

Add Canvas.Bounds, fix nil error when initialising directly without NewCanvas

Fix image rendering for PDFs, refactor image and color code to subdirectories

Update dependencies