Several updates and bugfixes for next version.

Done - 0.4-F3: Add check box component.
Done - 0.4-F9: Add additional error processing in FileManager.
Done - 0.4-F10: Add configuration for changing standard window buttons
position.
Fixed - 0.4-B4: [Issue #4] Update "Out of range" video buffer errors
processing.
Fixed - 0.4-B5: [Issue #5] Update window behavior when dragging it out
of the screen.