compiler: more flexible warning system #424
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* add `WarningKind` enumeration and simplify `Flags` structure * rename `warning_flags.Flags` as `WarningFlags` * remove temporary unreachable code hack * all targets have all warnings enabled by default * extend `WarningFlags` type with type functions * simplify `Target.enableWarnings()` and `Target.disableWarnings()` * add warnings for `const-return-type` and `idiomatic-parentheses` * accept both '$warnings unused' and '$warnings no-unused' etc.
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WarningKindenumeration and simplifyFlagsstructurewarning_flags.FlagsasWarningFlagsWarningFlagstype with type functionsTarget.enableWarnings()andTarget.disableWarnings()const-return-typeandidiomatic-parentheses