iucode_tool: support selecting by ucode revision
Add a third (and optional) parameter to microcode selection filters, to select microcodes by revision. The revision can be prefixed by the operators eq: (equal to), lt: (less than), or gt: (greater than). The revision numbering is signed, but in order to be more user friendly, since we display revisions as unsigned values in hex, we accept the range -INT32_MAX to +UINT32_MAX, and convert it to int32_t.
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