pc2/AuroraFlow: Emulation Support

This release includes emulation support for the AuroraFlow kernel. This is achieved by creating drop-ins for sw_emu (in HLS) and hw_emu (reusing the hw design) which write to unix pipes instead of the serial links.

The topology needs to be created using symbolic links on the unix pipes. Examples are provided for all existing test cases.

The repository structure was changed, so that on the top level only the AuroraFlow kernel is built. Now also including utilities for easier integration into Make and CMake workflows. The test example is now in a seperate folder.