Initialise Controller's DefaultFont description to that of the Platform default font

* Creating a TextControl after the System font has changed meant it did not use the new system font.
* This effected TextLabel and TextField, now creating a Text Control with no user defined font will make it use the current system font.
* Changing the current system font family will reflect in the Text Control
* Logging added

- Font Style and Point Size still has no impact currently

Change-Id: I8f92d0310b49a5fed1f6cf94218e9da7b6e4fca3
Signed-off-by: Agnelo Vaz <agnelo.vaz@samsung.com>