Implement --help in SDL backend
#20748
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This also changes bunch of logging from stdout to stderr. Conventionally, intended output goes to stdout, and diagnostic output to stderr. For a graphical application like PPSSPPSDL, pretty much the only intended textual outputs are results of `--help` and `--version`. The rest now mostly goes to stderr (there are still few straggler `printf`s left).
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Not super confident on some of the wording in |
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This also changes bunch of logging from stdout to stderr. Conventionally, intended output goes to stdout, and diagnostic output to stderr. For a graphical application like PPSSPPSDL, pretty much the only intended textual outputs are results of
--helpand--version. The rest now mostly goes to stderr (there are still few stragglerprintfs left).