JavaScript: Make `File` not extend `Locatable` anymore.
JavaScript: Make `File` not extend `Locatable` anymore.

Files have strange `:0:0:0:0` locations for... reasons. This makes the predicates inherited from `Locatable` meaningless. A particularly bad case is `getNumLines()`, which will always return one. The right predicate to use is, of course, `getNumberOfLines()`, which is defined in `File` itself.

github/codeql,github/codeql,github/codeql,github/codeql,github/codeql,github/codeql,github/codeql,github/codeql,github/codeql,github/codeql,github/codeql,github/codeql,github/codeql,github/codeql,github/codeql