CppTools: Define '<' and '>' as electrical characters

Required for auto-indenting stream operations. For example:

std::cout << foo
          << bar;

without explicitly invoking the indenter.

Change-Id: I3a88083af5295709dfecb384538078e236119b0b
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@digia.com>
Reviewed-by: Erik Verbruggen <erik.verbruggen@digia.com>