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155adc3f5d
The two main changes, done together in this commit, are: * Eliminating most instances of `aux_source_directory()`, replacing them with explicit file listings; and * Moving these file listings into respective subdirectories by representing respective nextpnr components as interface libraries. In addition, the GUI CMake script tree was simplified since it had a lot of unused/redundant code. The `aux_source_directory()` command is not recommended for use by CMake itself because it misses dependency changes when adding/removing files, and consequently causes build failures requiring a clean rebuild. This commit does not touch anything related to architectures/families, which are very complex and redundant all on their own.