Split a variable-setting string.
Split a variable-setting string. Given a string containing two words, separated by eiher whitespace or an equals sign, it returns a pointer to the second word (value), after clearing the spaces between.
The original string is modified so that the pointer given only points to the first word.
Given the string: "var = val" the original pointer will point to "var" and the returned pointer to "val".
All whitespace around the variable and value is stripped.