refactoring the code

adding new buttons to the designer page, and removing the pdf export/import functionality as part of the integrating schema editor features into the designer.
some more components are to be implemented in order to do a complete test cycle.

Signed-off-by: kb-yashodha <kb.yashodha>
completing the loading pages

Signed-off-by: kb-yashodha <kb.yashodha>
Merge branch 'refactoring' of github.com:kb-yashodha/phpmyadmin