co♻e: unittest framework for CODESYS

- Parts of "Implement optional parameters for the test results".
The following is implemented: Whether a test is skipped, failure message/type for a testcase.

- Moved the general test results (NumberOfTestSuites, NumberOfTestCases, NumberOfSuccessfulTestCases, NumberOfFailedTestCases) into the new test results struct ST_TestSuiteResults, which also containts the results for all test suites.

- Fixed adjusting of AssertFailureMessages from 252 to 253 characters (by removing an unnecessary space character)

- Added logging of all new extended/optional test result parameters to the logger

- Added report logic so that skipped tests are not included in the total amount of successful tests (NumberOfSuccessfulTests = NumberOfTests - NumberOfFailedTests - NumberOfSkippedTests

Updated restructeredText for;
.AssertArrayEquals_REAL()
.AssertArrayEquals_LREAL()

CfUnitVerifier result;

| ======================================
| Failed tests : 92</Entry>
| Successful tests: 91</Entry>
| Tests: 183</Entry>
| Test suites: 14</Entry>
| ==========TESTS FINISHED RUNNING==========

Added several new features/improvements;
* autodetect and skip an empty testsuite,
* AssertArray2dEquals_REAL(),
* AssertArray2dEquals_LREAL(),
* AssertArray3dEquals_REAL(),
* AssertArray3dEquals_LREAL(),
* TEST_FINISHED_NAMED(),
* Removed I_XmlControl and I_FileControl interfaces,
* FB_XmlControl,
* Renamed all FB_XmlControl methods
* FB_FileControl,
* FB_StringBuffer
* E_XmlError,
* Renamed External support into CODESYS Support