Add item tooltips - Update inventory-window, voxel-furnace, voxel-land

deathcap/inventory-window@4b833ac2441cc993de7cc1dacd5921fd8d3cbbb4 Add tooltips. Closes GH-11
deathcap/voxel-furnace@d67a6baf27b2e58c4d9634a0a67e2cb98b1030b7 Add iron ingot display name
deathcap/voxel-land@26907ee1f8b8eba2ebb8e0c604fb24fd4446d97f Add birch log display name

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