ECT 0.9.1

Changes: (v0.9...v0.9.1)

• various build fixes
• The previous release included changes within mozjpeg that changed the DC scan optimization mode. This improved compression on some files but worsened it on others. This version uses mode 2 instead, which usually results in better compression. While some files will compress better with mode 0 as used in version 0.9 and modes 1 and 2 can affect the display during progressive image decoding, this should be the most sensible option for ECT and generally provide better compression.