Add some tests for CGUIControlFactory

[notspiff]

Description

This adds some tests for CGUIControlFactory. They are not, nor meant to be, exhaustive tests for the logic, but only to help aid refactoring the XML parsing bits.

They are also not complete but this is all the monkey work I could stomach in one evening.

Motivation and context

2 > 1

How has this been tested?

Uhm, it is tests, dummy. It's tested by running the tests.

What is the effect on users?

None

Types of change

• Bug fix (non-breaking change which fixes an issue)
• Clean up (non-breaking change which removes non-working, unmaintained functionality)
• Improvement (non-breaking change which improves existing functionality)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that will cause existing functionality to change)
• Cosmetic change (non-breaking change that doesn't touch code)
• Student submission (PR was done for educational purposes and will be treated as such)
• None of the above (please explain below)

Checklist:

• My code follows the Code Guidelines of this project
• My change requires a change to the documentation, either Doxygen or wiki
• I have updated the documentation accordingly
• I have read the Contributing document
• I have added tests to cover my change
• All new and existing tests passed

[fuzzard]

Jenkins build this please

[garbear]

And thus more tests was superior to less tests. Good work.

[fuzzard]

Im happy to ignore the jenkins formatting for this. In a lot of the cases in the test file it makes things a little less readable