Add CLI apps, and a flags library #15
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This change adds
best::app, which isbest'smain()replacement. It also beings inbest::cliandbest::parse_flags, which provide a structured mechanism for defining and parsing complex command-line flags.This change includes a binary,
//best/cli:toy, which demonstrates all of the flag parser's features.It also includes some new integer parsing APIs, and gives the unit testing framework a flags struct: unit test can finally be filtered by name!