* Noise, and Noise-Area brushes now use Perlin noise, more closely simulating the method LL uses officially.
* TerrainModule has been cleaned up slightly.
* TerrainUtil class has several new functions related to seeded noise generation.
* Extracted ITerrainEffect, ITerrainFloodEffect, ITerrainLoader, ITerrainPaintableEffect, TerrainChannel to seperate files.
* W.I.P: Hydraulic Erosion (Spherical) paintbrush - code is all there, but some work is required on the initial parameters to get it to function correctly. Replaces the smooth brush when `newbrushes` is switched on.
* Implements the Optimised Erosion routine defined by Jacob Olsen in the paper 'Procedural Terrain Generation' (http://www.oddlabs.com/download/terrain_generation.pdf)
* Replaces the 'flatten' brush when 'newbrushes' is enabled.
* Added "script terrain newbrushes <true|false>" to enable experimental terraforming brushes. Presently the 'revert' brush is replaced with the Weathering brush, when enabled.
* *Much* faster terraforming (woot!)
* New "Brushes" design, so you can create custom terraforming brushes then apply those inplace of the standard tools. (ie an Erode Brush for example)
* New specialised "Flood Brushes" to do large area effects, ie, raise-area, now takes a bitmap rather than repeats the ordinary raise brush a thousand times.
* New modular file Load/Save systems -- write importers/exporters for multiple formats without having to hard code the whole thing in.
* Coming soon - effects system, ie the old Erosion functions, etc. for one-shot effects.
