Update docs and fix bugs (#149)

Improved the docs for the 3 main Tactility projects. I also fixed some inaccuracies and bugs in certain APIs as I went through the code.

TactilityCore/Source/kernel/critical/Critical.h

@@ -10,8 +10,15 @@ typedef struct {
     bool kernelRunning;
 } TtCriticalInfo;
 
+/** Enter a critical section
+ * @return info on the status
+ */
 TtCriticalInfo enter();
 
+/**
+ * Exit a critical section
+ * @param[in] info the info from when the critical section was started
+ */
 void exit(TtCriticalInfo info);
 
 } // namespace