lex: s/scanrune/read_rune/

s/is null/== null/g

this bothered me lol, i just want it to be consistent

check: fix completeness/size logic for structs

and other related stuff

check: require array element be complete object

eval: move into check

parse: fix hex float parsing

c: improve README

hareconv: initial-ish commit i guess

check: replace CONSTANT with CONSTEXPR_*

I think this is kinda incomplete-ish but I've had this unstaged just
kinda there for so long so like sure yeah it's fine

Add logo

parse: make switch exhaustive

Use never

Remove no longer relevant "harec bug" comments

Use opaque

s/os::BUFSIZ/os::BUFSZ/g

ast: add idents_free and idents_dup

Satisfies new pointer assignability requirements

Revert "check: recognize nullptr in type_is_pointer"

This'll fuck with type_deref. I should really just figure out what the
deal is in general with nullptr/nullptr_t

This reverts commit 065f7c257132f74545eba4faf02caa7ce109f634.

check: recognize nullptr in type_is_pointer

Update TODOs

check: qualify array member rather than array itself