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Fix some textures not being sent correctly to older clients
Since b2eb44a, a texture defined as `[combine:16x512:0,0=some_file.png;etc` will not be sent correctly from a 5.5 server to a 5.4 client due to the overeager detection of unsupported base modifier `[` introducing a spurious `blank.png^` before the modifier. Fix this by whitelisting which base modifiers can be passed through unchanged to the client, and prefix `blank.png` for the others (which at the moment is just [png:, but the list may grow larger as new base modifiers are added.)
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