Add Missing Concept Exercise Scaffolds + create Options concept + minor fixes to scripts

[0xNeshi]

Towards #103
Towards #255

Most of the "Files changed" are just newly added blank files.

This PR should include all of the concept exercise scaffolds and placeholders.

• For exercises that I copied over from other tracks, I added placeholder files and appropriate fields.
• For exercises I created specifically for this track, I either implemented the metadata (cryptographer) or implemented just the exercise implementation+stub+tests (chrono-realms-time-tree, chrono-realms, the-realm-of-echoes) and I added my username as part of the authors array (alongside whoever implements the missing content). <-- These are the exercises where the most of the stuff is going on.

[0xNeshi]

@BNAndras I'm not sure how far along you are with reviewing this PR, but if you haven't had the time (or the will) to review this, I would separate it out into many smaller PRs

[BNAndras]

I’ll have some time this week to take a look at that subset of files. At the moment, I can review it as a single large PR.