commit e3df8207322dbbdeabd907cce6160ae8693db13b
Author: Dino Bollinger <dino.bollinger@gmail.com>
Date:   Sat Sep 18 22:01:08 2021 +0200

    Duke3D: Add the CON commands `getngcflags` and `setngcflags`
    
    Usage:
    ```
    getngcflags <var> <idx1> [<idx2>...]
    setngcflags <const/var> <idx1> [<idx2>...]
    ```
    
    Gets/sets the flags for the newgamechoices entries at the specified
    indices. The index list is variable-sized, up to a maximum of 3.
    
    This can be used to enable/disable the MEF_Hidden and MEF_Locked state.
    Supersedes the userdef struct members:
    
    `m_newgamecustomopen` and `m_newgamecustomsubopen`.

commit 0516522f5f6b6c515129cf22b96341843997e3b1
Author: Dino Bollinger <dino.bollinger@gmail.com>
Date:   Sat Sep 18 21:44:36 2021 +0200

    Duke3D: Extend newgamechoices menu with a third layer of entries.
    
    Also permit usercontent flag on subentries.

See https://voidpoint.io/terminx/eduke32 for more details.