polymod

Remove `EExceedArgsCount` implementation for now, since it crashes the application.

PolymodScriptClassMacro: Remove `@:persistent` from generate callback

PolymodScriptClassMacro: Make registered flags persist across compilation server triggers

Add a new error `EExceedArgsCount` for exceeding provided arguments and reword `EInvalidArgCount` for better clarity.

Fix argument validation escalating outside of Polymod.