Easy/ish missing instructions

[64kramsystem]

A (sub)list of the possibly easy/ish missing instructions:

• [x] intern: 64kramsystem (#87)
• [x] swap: nvasilevski (#64)
• [ ] bitblt: easter egg for the masses!
• [ ] answer: The Answer to Life, the Universe, and Everything
• [ ] branchnil: difficult, but should be easy to copypasta from branchif
• [ ] setn: unsure if easy
• [x] opt_and: unsure if easy
• [ ] opt_or: unsure if easy
• [ ] opt_not: unsure if easy
• [ ] opt_str_freeze: unsure if easy
• [ ] opt_nil_p: unsure if easy
• [ ] opt_str_uminus: unsure if easy

Notes about others:

• [ ] newarraykwsplat: not easy but seemingly feasible; requires implementing (or inlining) many small functions
• [ ] expandarray: not easy
• [x] topn: implemented live

If anybody wants to take any, put a note/comment so that we accidentally don't work on the same one!

[rvalenciano]

Hi, @64kramsystem @tenderlove I would love to take a stab at one of these. I already have the project ready in my machine and running tests. Maybe I can start with bitblt ?