Implements the corresponding encoders, selects the appropriate one when
encoding URL search params. If an encoder for the given encoding could
not be found, fallback to utf-8.
(cherry picked from commit 72d0e3284b604c4c1373fb019250cdf5bd492300)
This cherry-picks the CodeGenerators changes from the second commit in
https://github.com/LadybirdBrowser/ladybird/pull/626
We'll want to enable -Wmissing-declarations (gcc) /
-Wmissing-prototypes (lagom) for Lagom too, but that can happen
in a separate PR.
(cherry picked from commit c62240aa80dceddd7e6ba5bf779a56c84ab8c624;
amended to remove half of the changes. Many of them were in
ladybird-only code. Changed commit message.)
The Encoding specification maps ISO-8859-1 to windows-1252 and expects
the windows-1252 translation table to be used, which differs from
ISO-8859-1 for 0x80-0x9F.
Other contexts expect to get the actual ISO-8859-1 encoding, with 1-to-1
mapping to U+0000-U+00FF, when requesting it.
`decoder_for_exact_name` is introduced, which skips the mapping from
aliases to the encoding name done by `get_standardized_encoding`.
(cherry picked from commit 6b2c4599017f512279cb26c0d3c48aa5a9453007)
