Larger cleanup to input-related source files (this time using unique_ptr). #23
+640
−791
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I took delroth's suggestion of using unique_ptr as well. However this required changes outside of InputComment to be done, and thus warranted it's own new branch (the previous one was called "small-inputcommon-cleanup" which would be inaccurate with the new changes)
This is open at the same time as PR #17 in case this one proves to be too messy (by opinion of course), then this one can be dropped and PR #17 can be used instead.
Anyway, feel free to point out anything that seems weird.