ToLower - ToUpper Heater, converting strings to lower and upper case letters
The ToLower and ToUpper Heaters convert strings to lower and upper case characters respectively. These Heaters have only one input, but the same output value can be used more than once.
ToLower: Converts all letters in the incoming string to lower case.
ToUpper: Converts all letters in the incoming string to upper case
Note: Only letters (A-Z, a-z) are altered, numbers and special symbols remain unaffected.