Sculpt dyntopo: Roughed out skeleton of new brush engine API

Command Lists

* The new system will be based on command lists
  generated by (eventually) a node editor.
* For now, the lists will be hardcoded.
* Idea is to make a minimal viable
  brush engine that won't cause file breakage
  when the upgrade to node-based brushes happen.

Brush Channels

* Wrote new structures and API to wrange
  brush parameters: BrushChannel.
* Supports, floats, ints, enums, bitmasks,
  with plans for vec3 and vec4.
* This will replace UnifiedPaintStruct,
  most of the members of Brush and the
  DynTopoSettings struct.
* Brush channels can
  be mapped to various input device
  channels (e.g. pen pressure); each
  mapping has its own associated curve
  (CurveMapping instance) and bounds.

Brush channel inheritence chaining

* Brush channels can form inheritence chains
* Channel sets are stored in three places:
  in the scene toolsettings, in Brush, and in
  individual brush commands.
* Node groups will also have a channel set.
* Channels in each set can be flagged to
  inherit from the parent set.
* Inheritence happens in seperate merged
  channel sets at runtime.  The final
  Brush channels live in Brush->channels_final,
  while the final command channels live in
  BrushCommand->params_final.

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