Add mods: technic, moreores, paintings, Nyancat (Pbj_pup). Small fix: sandwiches

mods/moreores/CONTRIBUTING.md

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+# Contributing to More Ores
+
+Thank you for your interest in More Ores! Before contributing,
+be sure to know about these few guidelines:
+
+- Contributions have to be licensed under the zlib license (or compatible)
+  for code, and CC BY-SA 3.0 (or compatible) for assets.
+- Make sure to update the changelog, keeping the
+  [changelog format](http://keepachangelog.com/en/1.0.0/) we use.
+- Don't bump the version yourself. Maintainers will do this when necessary.