Introduce a += operator in property file parsing that appends values to
existing string properties. This allows splitting long property values
across multiple lines for improved readability.
Example:
group.compilers=comp1:comp2:comp3
group.compilers+=:comp4:comp5:comp6
Error handling:
- Logs error and skips if += is used on an undefined property
- Logs error and skips if += is used on a non-string property
Includes unit tests for the new functionality.
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