* Fix BA2 compilation errors by implementing mipmap detection and usage during texture recompression
* Update CHANGELOG.md
* Fix broken mipmap support on Linux/OSX
* Make ImageConverter polymorphic and revert back to texcov on Windows
* Add files I forgot to add, make CHANGELOG.md additions
* Don't run texconv tests on Linux/OSX
* Add some support for cubemaps in BA2
* add read support for cubemaps in BA2 routines
* Fix slide support during compilation
* Set default logging level to Information instead of Trace
* update CHANGELOG.md