Corrections to allow compiling with mono V3

* Aurora.ScriptEngine.AuroraDotNetEngine.APIs - LSL_Types.cs - class
LSL_Types
  Add (float) type casting to '==' and 'Equals' overides
 *Remove OS compile IFDEF to include the == and != overrides when
compiling on the Mac

* namespace Aurora.Services.SQLServices.GridService -  private struct
NeighborLocation
  Add GetHashCode overide to satisfy compiler warning and prevent
incorrect a == b or a != b comparisons
* namespace Aurora.Modules.Caps - public class RenderMaterials -
RenderMaterialsPostCap()
    Remove comparison of te.DefaultTexture.MaterialID == null as it
should always be assigned at creation (debug only)
* Aurora.Modules.WorldMap - class AuroraWorldMapModule - private void
GetMapBlocks()
  Correct if..else.. logic when dealing with the item.mapblocks types
Terrain loading issue #1329

Correct loading of terrain files when using multiple regions

* Aurora.Modules.Terrain - TerrainModule.cs
    Harden LoadFile and SaveFile procedures to avoid complete crash on
an unexpected error

 * Aurora.Modules.World.Startup.SimulationData.FileLoaders -
TarRegionLoader.cs - class TarRegionDataLoader
    Correct console error message header on exception  (trivial but...
:) )
    Added additional console info during loading of backup file

* Aurora.Modules.Terrain - TerrainModule.cs
    Finalise updates to load terrain into the correct scene
* Aurora.Services.SQLServices.GridService - GridService.cs
    Add region size to info details
    Correct region URI details
* Aurora.Framework.Services - IGridservice.cs
    Add RegionURI to return region instance uri
* Aurora.Region - SceneManager.cs
    Add currently selected region name to console prompt

* Aurora.Modules.Terrain - TerrainModule.cs
    Update procedures to load terrain into the correct scene as selected

* Aurora.Framework.Sceneinfo - TerrainChannel.cs
    Correct problem when creating/loading a terrainchannel if the
source image is not the same as the region size.

Update runprebuild to use the mono/net4.5 spec (compatible with mono V
3.2.3)
Implement 'terrain generate' command for regions

Implementation of terrain generation functionality to assist creation
of new regions

Additional commands : terrain generate <Flatland/Mainland/Island> <Min
height> <Max height> [smoothing]
Correct git file timestamps

No code modified but update to correct the git commit of Alicia's pull
request #165