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Use -pgmF to run alex/happy

Currently, using GHC-in-GHCi is problematic when it comes to editing Lexer.x and Parser.y. Edits to those files are not detected by GHCi.

This can be solved nicely by using -pgmF to run happy and alex instead of using the build system. This way GHCi will rerun them to reload those modules.

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information