New unit tests: MPlusTestsUnit from TestMPlus.dpr

New unit tests: MPlusTestsUnit from TestMPlus.dpr

- New unit MPlusTestsUnit
- New unit AbstractTestHelperUnit so you can use methods CheckEqualsPointer CheckNotEqualsPointer in DUnit testcases and testsuites
- used AbstractTestHelperUnit in various places
- Aligned TestDmt.dproj project contents from TestDmt.dpr

Continuation of:
- https://github.com/jpluimers/HVRTTIUtils/commit/c79f4e516326dd3060d0842565fc1256f037759e

https://github.com/jpluimers/HVRTTIUtils/commit/c79f4e516326dd3060d0842565fc1256f037759e