Grease pencil tool now uses an icon for each tool,
previously it mapped icons to tool icons which is now not needed
because for each tool a different brush can be selected which has it's
own icon.
- Added icon for To Sphere
- Added icon for Shear
- Added icons for adding mesh objects
- Added icon for Curve Draw
- Add Curve Extrude to Cursor icon
- Tweak Curve Draw icon
- Simplified Hair Cut icon. Was hard to read
- Tweaks to Hair Puff and Smooth icons
- Added icon for Extrude Along Normals
- Updated Extrude Individual icon to become clearer and more consistent
with "Extrude Along Normals". Now it's easy to see the difference.
- Rip Edge and Rip Region icon tweaks
Note, many icons are regenerated in this commit which
weren't intended to be changed, in some cases this looks to be caused
by material color. Generating again doesn't modify so it
shouldn't be changing every time in future.
