C++14 deprecates and C++17 removes functions we use for random sounds.
This makes FastRand() fit the URG interface, and uses the appropriate
function.
Refs #5862
Differential Revision: https://code.wildfiregames.com/D3107
This was SVN commit r24302.
Remove some useless settings using the default values.
Remove the obsolete <Replacement> tag.
Update some documentation in the code, fix whitespace and unify line
endings.
Patch by otero, fixes#3268
This was SVN commit r17976.
