yf: Add eachUntil (= some) and eachrUntil.
Remove eachUntil and eachUntilReverse (and unused remove) from Array monkeypatch.
Pointer normalization is now performed.
Flip font glyphs during loading (since pixel store is also flipped by default.)
replaceState on startup rather than pushState, to ignore any restored session state.
If something else does somehow get a state on the stack, ignore it.
Rename yf.extend to yf.update (after Python).
Move Array moneypatching for without and extend to yf under those names.
yf.extend differs slightly in that it treats most array-likes identically to arrays.