Addresses #224 and properly parses all C++ numbers.

Reduce state count

Bump tree-sitter-c to 0.20.5, a couple template fixes

Adds GH tags queries

Support dependent operator templates

This change allows operators (not just fields/member functions) as dependent
template expressions.

```cpp
auto x = y.template operator()<int>();
```

This syntax is used e.g. to call C++20 lambda expressions with a template head
where the template arguments are not function arguments and therefore cannot be
deduced.

```cpp
[]<typename> () {}.template operator()<int>();
```

Support multidimensional subscripts

This change allows commas inside subscripts.

```cpp
auto x = a[1, 2, 3];
```

From C++23, array subscripts work like arguments to `operator[]` as an n-ary
function.

Before C++23, `operator[]` must be a unary function, but before C++20, it's
possible to use the comma operator inside subscript expressions - and this is
done in libraries that use expression templates to achieve multidimensional
array syntax.

Use of the comma operator in subscript expressions was deprecated in C++20 to
make way for the C++23 change to n-ary `operator[]`.

Some bug fixes

Update grammar from changes in C

Update c