[cpp] Add white space around template type syntax

[Aidan63]

You learn something fun new every day. Add white space around C++ template types to prevent it being interpreted as a digraph when the C++ standard is less than 11.

[jeremyfa]

It seems the leading space is the only one necessary, given what I've seen in existing hxcpp code base

[Aidan63]

yeah, thats what I read online as well. I'm just paranoid about odd features in old C++ standards now... Extra white space can't hurt? Right?

[jeremyfa]

Extra white space can't hurt? Right?

You never know 😆.

Anyway I'm just thinking using only the leading space would be more consistent to the existing workarounds I've seen, but yeah it probably doesn't hurt to have the trailing one as well, as long as it compiles fine...

[Simn]

I think I usually see only the leading space, not the trailing one. So I guess we should stick to that, especially if that's what hxcpp has been doing.

[Aidan63]

I've removed the trailing whitespace after the comma in the type parameter list but kept the space preceeding the closing ">", so generic externs are now consistent with the code Array, FastInterator, Pointer, and a few other templated types generates.