reduced Tokenizer::isC() usage

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Each Token (should) be connected to a TokenList. Tokenizer just encapsulates that so we have no need to check the Tokenizer but can simply ask the Token.

Also if we have function calls we pass in a flag to tell it if it is C/C++ we can get rid of that flag and simply ask the Token.

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I have the same changes for isCpp() and that should help with things as we still have code which assumes that it is C++ since we do not have access to a Tokenizer object.

This should also allow us to get rid of some references being passed around - maybe even getting rid of one of the various isCpp() methods. It's really awkward we can access the same object via different accessors - it makes things just more complex.

IMO we should also be passing the TokenList around instead of the Tokenizer if possible.

[firewave]

Requires #5853 to be merged first.

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Almost a whole week (actually three months including the draft period) without any feedback - merging.