returns the next token of a specified variable (only type variable!) to the variable "value"
The token is deleted from the variable.
token=variablename=token
Example:
setvar=mystring=first<char 9>second<char 9>third
tools=token=mystring=<char 9>
// return: first token "first", rest "second third"
meldung=first token "<value>", rest "<mystring>"
If token is not specified, <cr_lf> is used.