Remove old PROPOSAL tables, add new tables for gcc

This PR removes the old PROPOSAL tables (which still had .txt as file endings), and replaces them with new tables.

These are all tables that are produced when running the examples of corsika, i.e. this should improve the runtime of the CI because this means that tables don't need to be regenerated.

Note that due to an issue in PROPOSAL, these are only the tables for gcc! For clang, the filenames are different (although the contents are identical). This means that either we have to add a second pair of tables for clang, or we create links from the clang filenames to the corresponding gcc tables.