internal root package gets translated to @:allow()

[SmerkyG]

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Internal access specifier on root package gets translated to @:allow(), which in current version of Haxe does nothing. There is unfortunately no fix available to make this possible in the current version of Haxe. Discussions with Simn led to possibilities of using @:allow("") to mean the root namespace, but it is unclear if this is the direction that will be taken and when.