[image] Add QOI load/save.

Additionally:
- Firm up PNG loader with some additional checks.
- Add helper functions to `core:image` to expand grayscale to RGB(A), and so on.

TODO: Possibly replace PNG's post-processing steps with calls to the new helper functions.

core/compress/common.odin

@@ -128,7 +128,6 @@ Deflate_Error :: enum {
 	BType_3,
 }
 
-
 // General I/O context for ZLIB, LZW, etc.
 Context_Memory_Input :: struct #packed {
 	input_data:        []u8,
@@ -151,7 +150,6 @@ when size_of(rawptr) == 8 {
 	#assert(size_of(Context_Memory_Input) == 52)
 }
 
-
 Context_Stream_Input :: struct #packed {
 	input_data:        []u8,
 	input:             io.Stream,
@@ -185,8 +183,6 @@ Context_Stream_Input :: struct #packed {
 	This simplifies end-of-stream handling where bits may be left in the bit buffer.
 */
 
-// TODO: Make these return compress.Error errors.
-
 input_size_from_memory :: proc(z: ^Context_Memory_Input) -> (res: i64, err: Error) {
 	return i64(len(z.input_data)), nil
 }