This adds a "Brush" and "Options" tab to all paint editors. Now all primary brush settings that need constant access during most workflows (such as sculpting) are in the Brush tab, while settings related to the brush that are less frequently changed are in the Options tab.
The one exception is Particle Edit mode, in which case only the "Brush" tab is defined. This is because having only a couple options per tab is a silly waste of space. These can be split up if more tools/options are added later.