anydas build flag

[zohassadar]

Credit to @HydrantDude and @Kirby703 for the AnyDAS & 0 Arr code. This provides a way to add AnyDAS code to interim Gym builds and modifications. It also adds some functionality to the menu nametable script to allow for varying options based on the build flags.

[kirjavascript]

regardless of if this is merged now or not, it's good to have this code ready to go in in whatever state it takes