Stefan Schindler 0e1828ab03 Fix grammar verification
* Use `make check-lexer` to verify the grammar.
 * Extend grammar/README
 * Add make clean-grammar rule
 * Add target `check-build-lexer-verifier` to `make tidy`, so it will build the verifier with every build and catch future errors
 * Search for antlr4 with configure and find
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