IoUtils improvements

[mark-wiemer]

Description
Static methods are used to build and tear down the testing environment

Problems
Static methods only have one return value and are stateless. This means the client must track things instead, violating SRP and cluttering client code

Proposed Solution
Make IoUtils methods instance-based. This way, the IoUtils instance can store the default System.out and can build up / tear down testing environments with one method call

Acceptance Criteria

• IoUtils methods are instance-based
• One-line usage within all clients