Touchscreen Support

The proposal is below .

2-8-touch-gestures

Today there are a lot of touch devices that run Blender but no support is provided.

• Examples:
• Wacom Cintiq
• Wacom Mobile
• Apple Side Car (ipad - macbook mirroring)
• Microsoft Surface
• Microsoft Surface Book
• Microsoft Surface Studio
• Samsung 9 Pro
• HP Specter x360
• Dell XPS 15 2-in-1
• Lenovo Yoga C930
• HP Envy x360
• etc
• Please provide at least basic support.