use boolean ParmParse parameters instead of int for true/false, on/off

[BenWibking]

Describe the proposal
ParmParse supports reading strings "true" and "false" as bool types with true and false values. This is closer to Python syntax and expectations.

Describe alternatives you've considered
Keep using 0 and 1 to indicate true/false. But there is no reason to do this.

Additional context
Currently, we use 0 and 1 to indicate false and true, which is confusing for non-C programmers.