TextBase Viewer; Don't draw Add/Remove brush for 2-3 mouse moves

[ProcStack]

TextBase Viewer

Add support to toggle off Add/Remove brush drawing for 2-3 mouse moves, toggle hold.

This should speed up peripheral modes.

What this should help-

• Zooming in and out many steps in succession; 2-3 mouse moves to draw again
• Mid process, Character Searching and Edge Grow/Shrink iterations.

ToDo-

• TextViewer self.drawBrushRunner
  • runner>0 don't draw
  • Figure out if this is logically inconsistent, counter vs mode maintain
• Maintain current mode, TextViewer self.curProcessingMode
  • If self.curProcessingMode == -1, self.drawBrushRunner--
  • If self.drawBrushRunner == 0, draw brush