More various nix install improvements
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Add x256 and x512 icons: Smaller icons will look bad on today's high resolution displays.
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Rename appdata.xml to metainfo.xml: appdata is a legacy (and deprecated) naming convention. metainfo is what currently should be used as it's better supported and more future proof.
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Change screenshot url source from Steam to Github: These are the same screenshots, I just changed to the ones hosted on the promotional Github repo in case the ones on Steam are going to be removed at some point.
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Change summary to "Free first person arena shooter": It's much better practice to have a more brief summary that doesn't repeat points already made in the description.
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Add brand colors: They will make the game look more appealing on various Linux store frontends. On Flathub in particular, apps that have brand colors are more likely to be better promoted. I tried to find colors that best match the RE website. Here is how it looks like:
Since this wasn't merged yet, I've made some more changes/improvements in this PR:
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Changed summary to "Free agile arena shooter" in metadata, as the previous summary was a bit generic.
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Changed to component type "desktop-application" in metadata, as component type "desktop" is deprecated.
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Renamed appdata to metainfo in system-install.mk - in case someone still uses this, it should now work properly due to renaming "redeclipse.appdata.xml.am" to "redeclipse.metainfo.xml.am" in one of the previous commits.
Now, everything is ready to be merged.