First pass at updating from MISRA 2004 to MISRA 2012:

First pass at updating from MISRA 2004 to MISRA 2012:
Updated pvContainer member of list items to List_t * rather than void * as they are always contained in a list if anywhere.
Made EventGroupHandle_t typesafe pointer to forward referenced struct rather than void pointer.
Made TaskHandle_t typesafe pointer to forward referenced struct, rather than a void pointer.

git-svn-id: https://svn.code.sf.net/p/freertos/code/trunk@2542 1d2547de-c912-0410-9cb9-b8ca96c0e9e2