Test codes

Investigated the GDI creation leaking by commenting code and profiling for memory. Made also two more test codes that verify the show and hide of objects for 1000 times and another test that shows and hides objects in property grid for 100 times.

Will continue investigating this bug as it is important to solve it. In order to finish some of the tasks proposed for iteration will allocate also some hours for making tests for 2D shapes and for finishing the Extrude.