Compilation issues under VS2017

[DominikWitczakAMD]

Apart from the two major issues I've reported in other tickets, I also had to resolve the following glitches in the code to get it to build:

1. CacheAlignedUniquePtrT definition: T[] had to be changed to T
2. Image definition: I had to manually specify copy assignment operator for the class.
3. ButteraugliComparator: I had to unconstify the member fields.

Please consider modifying the source code so that other folks don't have to go through the same process. Thanks.