resources: Remove derivative images

This commit adds `ImageUtil::bufferedImageFromImage`,
`ImageUtil::alphaOffset`, `ImageUtil::grayscaleImage`, and
`ImageUtil::flipImage` functions and applies them to client and plugin
code to remove unneeded derivative images from the resources directory.
This commit is contained in:
Jordan Atwood
2018-07-29 19:14:14 -07:00
parent 06cd5cd7d0
commit 8fb36d3ea4
25 changed files with 292 additions and 34 deletions

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