[FEATURE] Types: Added formatOptions.source for Float and Integer

When number values in the model are available as strings only (like
Edm.Decimal), the source format allows to define the format to convert
the numbers before writing them back to the model.

Change-Id: I93809fddcb9c9b4a84a23053a0cff59ecc1967ae
[INTERNAL] unit tests added and small fixes

- alignment of events add, remove and update in the different panels
- update unit tests
- adding new GroupPanle unit test
- adding a missing DisplayFormat property for ValueHelp support

Change-Id: I895ea1f14539236381f034978e5e4bc671f83e1b
Merge "[INTERNAL] unit tests added and small fixes"
Merge "[FEATURE] Types: Added formatOptions.source for Float and Integer"