Ads a dimension for testing/developing. On entering the dimesnion it CLEARS YOUR INVENTORY (((be careful as you cant get you items back!!!))) and changes your gamemode to creative. On leaving the dimension your gamemode is changed to survival and your inventory is cleared so no sneaking stuff from creative mode.
WARNINGS: If your in a survival world and are using the dimension for showcasing you inventory will be cleared with no way to get back your items! Akso make sure you go in to fly mode ASAP as you are teleported to y level -59 and will fall in the void and die (there is a stone platform at world spawn like in the void preset on a flatworld)
If you find any bugs (mainly about getting items from the test dimension to the normal world) please let me know so i can fix it.