[ Implemented ] Update button for sketches

[Intuos5]

Motivation / Existing Problem
When moving a workplane, the sketch that is associated to a workplane needs to be updated. This is currently done by entering and exiting the sketch.
https://youtu.be/4Al3yw2klHA?t=353

Description
Ideally, there would be an update button next to the pencil button, which would update the sketch in a single click. This saves users from having to enter and exit a number of sketches.

Alternative Solutions
Entering and exiting sketches is possible, but requires more clicks and changes the display of the object as well. Ideally, you can immediately see the changes in the mesh.

Mockup

[hlorus]

There's now a global "Force Update" button which can be used to reconvert all sketches. Not sure if this should be possible per sketch...