Add test cases for ParamHandler
Add explanations for test cases
Move test folder to correct location
Add tests for getParamValues
Remove obsolete test
Add tests for world_element
Add tests for toElement and getElementParams
Convert doctest in ConditionProperty to unittest
Add test for Conditions: Or, HasProperty and IsSpecified
Fix faulty test for setProperty
Convert json doctests to unittest
Move tests from test/core folder
Make param serialization test independent of item order