gfx: moved splashscreen RLE algorithm to the gfx library

Looks good to me! Thanks for keeping our codebase clean.

However, I'm only a bot - so a human will still have to approve this request.

added 3-Bootloader label

added 3-Epicardium label

@schneider: Would you be ok with this change? It's a bootloader modification and I am a little scared about those as we are quite close to flashing the boards.

added 6 - Needs Review label

@msgctl, sorry for the uber-long delay on this. Can you rebase on master so we can get this change merged? Ideally !220 (closed) can then make use of it.

added 6 - Changes Requested label and removed 6 - Needs Review label

assigned to @rahix

added 567 commits

• 01258f29...ee45bbd8 - 566 commits from branch master
• 14d9754e - feat(gfx): Moved RLE decoding code to lib/gfx

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added 6 - Needs Testing label and removed 6 - Changes Requested label

Rebased, tested. Seems to work fine for Epicardium! The bootloader is broken on master right now, so I can't test it there atm.

Tested ontop of bootloader fix (!323 (merged)), works as well!

added 6 - To Be Merged label and removed 6 - Needs Testing label

Will be merged after !323 (merged) lands.

added 10 commits

• 14d9754e...fd5ad609 - 9 commits from branch master
• 9865e5fe - feat(gfx): Moved RLE decoding code to lib/gfx

Compare with previous version

merged

mentioned in commit d2e49062