updated code to use mapper->SetInput instead of SetInputConnection. All widgets except plane, images ans texts

Fix compilation erros when compiling this constructor.
First argument type of "convertTo" should be instance, not a pointer of instance.

First pull request was created for master branch.
But it should be marged for 2.4.
https://github.com/Itseez/opencv/pull/2113

Logical mistake in macro fixed;
DeviceInfo deligate reimplemented;
Build and warning fixes.