Experiment with Designated Initializers in the repo for readability

referencing [this document](https://gcc.gnu.org/onlinedocs/gcc/Designated-Inits.html#Designated-Inits)

On some tables/structs in the repo, having an explicit note of what the data corresponds to will be very beneficial to readability in my opinion.

Benefits:
- Allows out-of-order struct and array initialization
- No need to cross-reference struct/array definitions

Downsides:
- If this were to affect the entire repo, in some small cases it's more work than it's worth (the Linux kernel has a ton of examples where for the sake of `readability` they create an enum for a 3-element array that is never used anywhere else)
- New users might be confused on the syntax at first (even I was when I first saw it on an array in Linux)

Therefore I only envision this being useful in certain cases where readability takes a hit (looking at #467)