Avoid using deprecated API, use new render events.

Potentially fixed some rendering issues, too.

Fixed tests.

Use texture instead of texture2D for MacOS.

Upload textures for projectors immediately to avoid GL error before f…

…irst frame arrives.

Add JEI plugin to tell it about the sidebars in our computer/robot UIs.

Fix devices not being released when computer is destroyed while running.

Fixed disk drives being read-only. Fixes fnuecke#103.

Update Forge and simplify mixin stuff.

Update docs.

fixup! Add option to clean up stuff (via unmount) when devices go mis…

…sing. For block devices, this can happen when the block is broken while the computer is unloaded, for example. For items this is more esoteric, but it theoretically means items disappear while the container managing the item as a device is unloaded.