2.2.2 - Fix code replacement bugs

This release is driven by a replace call that would cross variable boundaries when templating C++ code. While easy to work around, the error was quite confusing for the user.

What's Changed

• Use regular expressions for variable replacement by @gordonwatts in #248
• Don't duplicate library or include files by @gordonwatts in #249
• Use ast.unparse rather than ast.dump by @gordonwatts in #250

Full Changelog: 2.2.1...2.2.2