Enable Cross Platform (Issue #30)

[RhysTabor-dev]

Changes

• Drop PBIXInspectorWinLibrary in place of PBIXInspectorImageLibrary
• Migrate from System.Drawing to SkiaSharp
• Update PBIXInspectorCLI to point to PBIXInspectorImageLibrary
• Update PBIXInspectorWinForm to point to PBIXInspectorImageLibrary
• Add ColorPalette to tidy up SKColors declarations
• Add PaintPalette to tidy up SKPaint declarations
• Reformats constant paths to use Forward Slash / instead of Back Slash \

The intention of this change is in relation to Issue #30 to enable Cross-Platform output of all formats, including HTML and Images.

[NatVanG]

Many thanks Rhys, I will review asap :) This had been on my to-do list and I'm really grateful for your contribution.

[NatVanG]

Thanks again Rhys, identified some issues i.e. 1) unit test fails due to win library rename, 2) font size in Skia wireframe pages is smaller than original, 3) as yet unidentified cause of error when rendering wireframes for a local report.json file. Shall I commit fixes to your branch first?

[RhysTabor-dev]

Thanks again Rhys, identified some issues i.e. 1) unit test fails due to win library rename, 2) font size in Skia wireframe pages is smaller than original, 3) as yet unidentified cause of error when rendering wireframes for a local report.json file. Shall I commit fixes to your branch first?

Hey, ah great - thanks for spotting. Feel free to check in any already made fixes to the branch, I'll take a look into the local report.json failure as soon as I get a chance.