Blender Git Loki

Sculpt/Paint UI: Add a new menu for brush options.

For vertex/weight/texture paint, this has only the flags for using
unified size/strength. (Addresses TODO in code, before only sculpt
menu had these settings.)

For sculpt, moved the brush-related settings from the sculpt menu to
the brush menu.

Note that these menus are still very out of date (missing lots of
options), will address that in a different commit.