Re-register most aspects of default:chest and default:chest_locked,
using the technic chests code, so that the wooden chests fit properly
into the sequence of chest types. This mainly affects the formspec,
which now uses the style of the other chests, rather than the bare style
used by the default mod.
All the chests added by technic specify their material in their
description, so the description "Chest" for the default chest looks
ambiguous. Rename it to seamlessly fit into the range of chest types.