The EXR decoder maps file values to scaled values, but the encoder read
native values. Pixel formats whose native range is not [0, 1], such as
HalfVector4, wrote wrong color and alpha values to the file.

Fix EXR encoder to write scaled values

Fix grayscale ICC profile conversion

Fix ICC rendering intent consistency and clamp sampled curves

…ffer-leak-on-cancel

fix: Dispose chunk data buffer in ReadChunkData when read is cancelled
(cherry picked from commit eefdbd9)

…size

Fix quadratic buffer growth in lossy WebP Vp8BitWriter

(cherry picked from commit ec0c47e)

Backport PNG cancellation buffer disposal fix to v4

Backport lossy WebP buffer growth fix to v4

Update v4 licensing infrastructure and security policy