Implement new R GraphicsEngine features (Version 13 - 15)

[Florian Rupprecht]

R added new GraphicsEngine features in current and upcoming Versions:

 * Version 13: For R 4.1.0
 *             Added graphical definitions
 *             - linear gradients
 *             - radial gradients
 *             - patterns
 *             - clipping paths
 *             - masks
 *             Added deviceVersion
 * Version 14: Added deviceClip
 * Version 15: For R 4.2.0
 *             Added more graphical definitions
 *             - groups
 *             - paths
 *             - luminance masks
 *             Added capabilities

This issue is low priority for now. I might implement everything at once after 4.2 is released and other packages support the new features.