Rules are detected as import statements

[ferraith]

In rare situations it's possible that setuptools-antlr detects an ANTLR rule as a grammar import statement.
The bug can be reproduced with the following rule:

fImport
    :   'import' (importedNamespace=fImportedFqn 'from' | 'model')
        importURI=STRING
    ;

The root cause is a wrong regular expression to find import statements:
^\s*import\s*(.*)\s*;