Add support for module initializers #992
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Note that the requirements bullet list in the description of "The ModuleInitializer attribute" refers to the grammar rule parameter_list, which is defined by the V9 feature "Records."
We say, "A module may have multiple initializers, which are called in an implementation-defined order." However, we do not say anything about their order w.r.t execution of static constructors. Should we? My (limited) testing showed that a static constructor in a type T executed before any module initializers in that type.