v0.7.0

Fixed

• #50 Fixed handling of padding bytes in absolute mode for RLE4 compressed files.

Added

• #51 Added RawBmp::colors method to iterator of the raw color values in a file.
• #51 Added DynamicRawColors, RawColors, Rle4Colors, and Rle8Colors iterators.

Changed

• (breaking) #49 Use 1.81 as the MSRV.
• #46 Bmp::from_slice is now const, so BMPs can be put in consts and statics.
• #47 Ignore compressed data length on RGB compression method.