Fix tokenization for method call on integer

[Jomy10]

Given the following code snippet:

a := 6.add(5)

The tokenizer will generate the following tokens:

Ident(a), Declare(:=), Float(6.), Ident(add), OpenBracket((), Integer(5), CloseBracket())

However, the Float(6.) token should be Integer(6), Dot(.).

This requires either a rewrite of the tokenizer, disallowing \d+\. as a float, or tokenizing floats differently.