Fixed issues in the framework
Added the ComboBox Element
Added XML Configuration with infinite sub configuration
Changed the mian.settings to xml format
Added the Error Verbose with the custom error handler, that use a custom
error page, now you can configure Error Verbose level (see ErrorVerbose
constants) to ignore some errors, notice and warnings.

Added Image, Frame(iframe) and Label elements
ErrorPage received a new style
ControlWriter now can check if it has a attribute and fixed the bug whos
when you remove a attribute and it's not exists, the Dictionary fires
"Key not found" exception, but now the control writer check if the
attributes really exists before remove it.

Button now only allow the client CLICK event 



Change-Id: I6ea4167aab12f1568432b95c1919958e14afbfa6
Signed-off-by: Marcelo <Marcelo@DES214>