Update per stdlib changes

Fix compilation with latest harec and stdlib

decoder_bufsiz: Allow PLTE with bit depth 4

Not sure why these lines were there in the first place.

Signed-off-by: Lassi Pulkkinen <lassi@pulk.fi>

Abort on attempt to create chunk reader at invalid position

To improve debuggability of bugs similar to the previous commit. Such a
bug could also occur in user code.

Signed-off-by: Lassi Pulkkinen <lassi@pulk.fi>

plte_read: Finish chunk reader properly

Call io::read at EOF so that the chunk reader knows to read the
checksum.

Signed-off-by: Lassi Pulkkinen <lassi@pulk.fi>

Add missing ? operators

Signed-off-by: Lassi Pulkkinen <lassi@pulk.fi>

Fix typos/incorrect names

Signed-off-by: Lassi Pulkkinen <lassi@pulk.fi>

s/png::read/png::load/g

Update custom streams according to static vtable change

Makefile: use $(HAREDOC) for docs

Signed-off-by: Sebastian <sebastian@sebsite.pw>

Makefile: use $(HARE) for check

Signed-off-by: Sebastian <sebastian@sebsite.pw>

README.md: add dependencies

Signed-off-by: Drew DeVault <sir@cmpwn.com>

.build.yml: add hare repository

Add .build.yml

docs improvements

Initial prep work for interlacing

decoder: remove redundant checks

This is handled by the ihdr decoder

all: improve error handling

cmd/pngdump: new command

idat: correct deflate => inflate