[FIX] Call ctrlk_process from user CAL in direct implementation

Add missing ctrlk_process call in direct implementation to process
background tasks of the control kernel module.
This fix avoids the kernel internal queue to overflow since
eventkcal_process is called now.

Change-Id: I88ff6d90beae548dc95d7a5d42971608a5bbf744
[FIX] Add missing grouping for Windows source files

In Visual Studio, source files can be grouped in the projects.
Recently added stack files were missed out and are added to the
source code grouping in the CMake project configuration.

Change-Id: I059c2b71f9ee15b1c170bb993280d69dfe128182
[FIX] Remove stack project include from demo applications

The stack project directory is removed from the demo applications'
include path as oplkcfg.h is no longer required for the application
build process.

Change-Id: Iaec481152dab8e73dddb8dfefb4ccbd8b42a287b