"Quantizer" should have a getter for "paletteSize".
Rename "OctreeQuantizer" to "FastOctreeQuantizer".
"FastOctreeQuantizer" reduces the number of colors to 256.
Rename "PixelOctree" to "Octree".
The depth of "Octree" can be any integer larger than or equal to 0.
Clean up the "Octree".
Rename "maxDepth" to "depth".
"Octree" has the pyramid of "Octcubes".
"Octree.add" requires a sequence of unsigned integers as a key.
Remove needless import statements.
"Octree" creates the pyramid of "Octcubes" on initialization.
Merge branch 'feature/octcube-pyramid' into prototype