* Add a detail_size field to the Sculpt struct, two new sculpt flags,
and a Mesh flag for dynamic-topology mode; that's it for file-level
changes needed by dynamic topology
* Add RNA for the new DNA field and flags
* Add a new icon for dynamic-topology created by Julio Iglesias. TODO:
update the icon for the new SVG icon format
* Add a SculptSession function for converting from BMesh to Mesh,
handles reordering mesh elements and setting face shading
* Made SVG versions of the NLA solo (star) icons. These are much nicer than the hack 'n slash bitmap versions, but could still do with some polish. The svg is too heavy to do fine tweaks here.
* Ported over the mute/graph-visible icons
* Recreated Drivers icon
* Moved Blender icon from AD1/DA1 to AD16/DA16, as per the trunk icon sheet