- Do not rewrite if nothing needs to be changed
- Update at program exit, in addition to updating when continuing from main menu to game

Defaults modified from original: alpha=200, key=F10

- Node placement code moved to Lua
- Mineral system removed (added default:stone_with_coal and default:stone_with_iron).
- MapBlock and MapNode serialization updated.
- Mapgen: Frequency of iron increased.
- node_dig callback and related changes.

Rename menu background to menubg.png, move unknown_block.png and unknown_object.png to client, make generating a placeholder image for the filename "" not cause an error

Use the logger; also, default to not showing much crap in console. Use --info-on-stderr to enable crap.

This allows us to map the keys which are not considered in
irrlicht's EKEY_CODE system, such as \, [, /, ] etc.

Put the gettext init code in a macro and define it appropriately
depending on whether gettext is actually available or not.