Complete the move of random number helper functions from the random map library (rP9096, refs #6) to globalscripts.

Differential Revision: https://code.wildfiregames.com/D596
Patch By: bb

rP19109 introduced pickRandom and its petra chat application,
rP19270 used the randFloat function more often, introduced randBool and randIntInclusive/Exclusive

to replace randInt (whose behavior and argument meaning depended on the number of arguments) calls in the GUI and simulation,

rP19305 changed randInt to pickRandom for random maps,
rP19355 introduced randBool with a probability and replaced deprecated randInt calls for random maps,
rP19443 replaced randInt calls with randIntInclusive/Exclusive for random maps except the Unknown,
rP19464 removed optional arguments of randFloat,
this commit replaces the remaining occurances in the Unknown maps,
thus fixes #4326 (old patch from refs #3102).