Bump version to 10.4.6.0 and update Changes

Author: johnhaddon

Changes

@@ -1,16 +1,24 @@
-10.4.x.x (relative to 10.4.5.0)
+10.4.6.0 (relative to 10.4.5.0)
 ========
 
+Features
+--------
+
+- MeshAlgo : Added new MeshSplitter class, for efficient splitting meshes based on uniform primitive variables.
+- ImathHash : Added new header that defines `std::hash` for Imath types.
+
 Improvements
 ------------
 
 - PointsPrimitive, Primitive : Accelerated bounds computation using `tbb::parallel_reduce`.
+- MeshAlgo : Improved performance of `segment()`.
 
 Fixes
 -----
 
 - ImageReader : Fixed compilation with versions of OIIO < 2.4.
 - USDScene : Invalid primitive variables are now skipped during loading, with a warning being emitted instead.
+- MeshAlgo : Fixed crease handling in `deleteFaces()`.
 
 Build
 -----

SConstruct

@@ -56,7 +56,7 @@ SConsignFile()
 
 ieCoreMilestoneVersion = 10 # for announcing major milestones - may contain all of the below
 ieCoreMajorVersion = 4 # backwards-incompatible changes
-ieCoreMinorVersion = 5 # new backwards-compatible features
+ieCoreMinorVersion = 6 # new backwards-compatible features
 ieCorePatchVersion = 0 # bug fixes
 ieCoreVersionSuffix = "" # used for alpha/beta releases. Example: "a1", "b2", etc.