add colon to sign, minor tweak to semicolon texture
Fix inverted conditional that prevents microwaves from working
Tweak infotext of microwave to say "Microwave is ..." instead of "Furnace is..."
More infortext tweaks
Test
Add decorative window-unit air conditioner
also, renamed nodes.lua -> misc_nodes.lua
Phased out all deprecated minetest.env:* uses in favor of minetest.*
minor tweak to slab and quarter-slab glowlights - better top/bottom textures
brass ingots are now in a group, brass_ingot, all recipes that use them have
been changed.