add export option for atlas info files

[Morilli]

Converts clientstates/*.cdtb files to a json-format including all relevant information. Those files are used to index atlas dds files, contained is information about all the atlas's subimages.

Example file clientstates/gameplay/ux/endofgame.cdtb gets converted to:

{
    "UIAutoAtlas/ClientStates/Gameplay/UX/EndOfGame/atlas_0.dds": {
        "ASSETS/UX/TFTMobile/Modal/TFTM_Modal_ContinueShroud.TFTmT1318.png": {
            "startX": 0.00390625,
            "startY": 0.015625,
            "endX": 0.853515625,
            "endY": 0.5703125
        }
    }
}

Open to suggestions about naming and stuff. This also will require basic testing to make sure all files parse cleanly.

[benoitryder]

Nice changes overall.

• I would suggest a list rather than a dict for the inner dict, especially because the PNG path is hardly "guessable".
• We should convert asset paths to paths as used on raw (lowercase the path, change .dds to .png, ...); this is much easier to use (which means less questions to us!).
• I don't know if it's easy, but could we provide dimensions in pixels? (This would require to read the png file but maybe it's worth it...)
• Should we gather all the atlas descriptions into a single file? (No strong opinion on this.)

With proposed changes:

{
    "game/uiautoatlas/clientstates/gameplay/ux/endofgame/atlas_0.png": [
        {
            "path": "ASSETS/UX/TFTMobile/Modal/TFTM_Modal_ContinueShroud.TFTmT1318.png",
            "startX": 0.00390625,
            "startY": 0.015625,
            "endX": 0.853515625,
            "endY": 0.5703125
        }
    ]
}