NTSL: Cleanup, Added some functions

General cleanup, removed out-commented code and generalized stuff.

**Added:**
* implode(list, string) -- Opposite of explode
* min(...) -- Returns the lowest number of the arguments
* max(...) -- Returns the highest number of the arguments
* randseed(number) -- Initializes the random generator with a new seed
* rand() -- Returns random float between 0 and 1