BMP files encode the direction of the rows with the sign of the height.
Our BMP decoder already makes all the proper checks, however when
constructing the Gfx::Bitmap, didn't actually make the height positive.
Boog neutralized :^)
This was the only remaining codec that produced IndexedN bitmaps.
By removing them, we'll be able to get rid of those formats and simplify
the Bitmap and Painter classes.
It is unlikely this is needed anymore, and as pointed out things should
now safely return OOM if the bitmap is too large to allocate.
Also, no recently added decoders respected this limit anyway.
Fixes#20872
The ideal size is the size the user will display the image. Raster
formats should ignore this parameter, but vector formats can use
it to generate a bitmap of the ideal size.
There was a TODO questioning whether breaking on >4bpp images
was the correct behaviour when RLE4 was detected. There is no
indication in the spec that RLE4 can be used with anything >4bpp,
so I believe this doesn't require additional follow-up.
MS Spec:
https://learn.microsoft.com/en-us/windows/win32/gdi/bitmap-compression
