Import the code coverage test additions from the (unpublished) Visual Studio project...

Import the code coverage test additions from the (unpublished) Visual Studio project to the (published) MingW/Eclipse project.
Update the MingW/Eclipse project to add a code coverage build configuration in addition to the existing Debug build configuration.
Update StreamBufferDemo.c so functions are called directly, rather than via configASSERT(), so their code coverage can be measured when configASSERT() is not defined.
In the Win32 port, replace the call to TerminateProcess() in vPortEndScheduler() with exit( 0 ) - which triggers the writing of the code coverage data to the disk.
Fix bug in ucStreamBufferGetStreamBufferType() - which is only used by the Percepio trace tool.
Update the line within vTaskStartScheduler() that was setting xTickCount to 0 to instead set it to configINITIAL_TICK_COUNT.

git-svn-id: https://svn.code.sf.net/p/freertos/code/trunk@2534 1d2547de-c912-0410-9cb9-b8ca96c0e9e2