Simutrans-Squirrel-API: Available functions from the squirrel standard lib

Simutrans-Squirrel-API r12240

Math Library, see http://squirrel-lang.org/squirreldoc/stdlib/stdmathlib.html#squirrel-api
String Library, see http://squirrel-lang.org/squirreldoc/stdlib/stdstringlib.html#squirrel-api
System Library: functions clock, time, date, see http://squirrel-lang.org/squirreldoc/stdlib/stdsystemlib.html#squirrel-api