Add RenderPrimitive opposite to hide (show)

[DragonDev1906]

Adding the "Show" RenderPrimitive, with which a list of blocks can be defined, and all other blocks are hidden.
As described in #1776 this was previously possible but this should make it easier and be more performant because the list of blocks is smaller.

Example config (only show ores):

renders["normalrender"] = {
    "world": "Test12985",
    "title": "Normal Render of Testworld",
    "rendermode": [Base(), EdgeLines(), Show(blocks=[14, 15, 16, 21, 56, 73, 129, 153])],
    ]
}