Add the EU_string helper function
In comparison to pretty_num it uses SI prefixes, adds "EU" (e.g. kEU) and rounds the number for readability
Add a constant_digit_count boolean setting
This is an algorithm that I designed myself. It fixes an
issue with the old code where it would be more eager to
move in some directions rather than others. This bug
resulted in, eg, a lead block on a radiation source's
+x side protecting you when you were directly overhead.
Changes:
* Make rayIter a global utility, and use it for radiation too.
* prettynum -> pretty_num and cleanup.
* Remove resolve_name/function_exists (unused).
* Cleanup nuclear reactor code.
Don't load the whole digging area when only a small piece is relevant.
Also, move the (time expensive) check whether the air above a block is free to the last position, which spares unneccessary checks when multiple quarries are placed together, or a quarry has to loop over air for another reason.
Supply the on_refill hook for power tools and cans, to perform appropriate
charging. This is to be used by unified_inventory's creative-mode
refill slot.
