[1.12.2] 1.80pr1.12

Changes from the last CC:Tweaked release

This is just another bug-fix release, with a couple of minor enhancements.

• Using longs inside .seek rather than 32 bit integers. This allows you to seek in very large files.
• Move the /computer command into the main /computercraft command
• Allow copying peripheral names from a wired modem's attach/detach chat message.

Minor fixes

• Fix InventoryUtil ignoring the stack limit when extracting items
• Fix computers not receiving redstone inputs sent through another block.
• Fix JEI responding to key-presses when within a computer or turtle's inventory.