Make HAL headers C-compatible (#1177)

Also fix the return type of HAL_IsNewControlData() and HAL_MatchType's type.

Since UsageReporting is intended to be namespaced, it is hidden when this is being used in C.

Fixes: #476
Closes: #535
Ref: #1122

hal/src/main/native/athena/FRCDriverStation.cpp

@@ -307,7 +307,7 @@ void HAL_ObserveUserProgramTest(void) {
   FRC_NetworkCommunication_observeUserProgramTest();
 }
 
-bool HAL_IsNewControlData(void) {
+HAL_Bool HAL_IsNewControlData(void) {
   // There is a rollover error condition here. At Packet# = n * (uintmax), this
   // will return false when instead it should return true. However, this at a
   // 20ms rate occurs once every 2.7 years of DS connected runtime, so not