Unique wireframe color for sculpt mode

Currently, the selection state of the sculpting object affects what the wireframe looks like in sculpt mode (it can be either active or inactive before entering sculpt mode). This can be an issue if there isn't have enough contrast with the sculpting shader.

Selection state of the object shouldn't really affect the active sculpting object since its the only thing you can sculpt on anyway. Adding a custom wireframe color to the themes editor would allow the user to easily create good contrast when sculpting.

In the 'Theme 3D View' there is currently wire color entry for object mode (called just 'wire'), one for edit mode (wire edit), so I'm suggesting adding one for sculpt, maybe called 'wire sculpt'.