Core: Fixed greedy targeting bug

[RunDevelopment]

This PR fixes a bug of greedy matching.

The target parameter defines the token which causes rematching. Rematching is done by recursively calling matchGrammar where target will be the current token name. The rematching is done if either a match was found or we reached the target token, whatever comes first.

The bug is that a token is identified by its name. But the name alone doesn't uniquely identify a token in a grammar because many tokens can have the same name:

{
    'token': [
        /foo/,
        /bar/i
    ]
}

The fix is quite obvious. target will no be a combination of the token name and its index.

Note: This is a technically a breaking change because matchGrammar is publicly exposed. But the function is also not documented, so its behavior is undefined anyway.

---

Edit:
An example of the bug is the following JS code:

// /*

/* const

Before:

After:

[mAAdhaTTah]

Possible to get tests that demonstrates the fixed behavior?