This reverts commit 875f1327.
Fixed width format specifiers are only officially availale in C99 and C++11.

Looks like a bit of hasty copying and pasting from s_item.cpp.

Also fixes long-standing accuracy issue due to unknown wider
object count not being incremented.

Unless I'm mistaken, the chunk of code I'm moving there is potentially
executed hundreds of times inside the loop to get the exact same result
every time

Remove flagmask field from set_mapgen_params table
Add small bits of needed documentation

Add check for datatype overflows
use native datatype indices instead of fixed 16bit/32bit ones

Add checks for invalid user input for important settings
Rename Settings::tryGet* to Settings::get*NoEx for consistency