Merge branch 'master' into beta

Fix generating CompressedImage with mask

Merge branch 'master' into beta

Add new "Image Color" parameter in brush slots (fix aseprite#1259)

Fix webp decoder

Update FLIC library

Expand filename wildcards in command line on Windows (fix aseprite#1049)

Don't activate our app ignoring other apps on OS X

Enable Edit > Copy anyway if layer is locked/non-editable

Fix memory leak on RecentListBox