Classify other libraries' headers properly and fix committed formatting issues (#620)

wpilibj/src/main/native/cpp/.styleguide

@@ -0,0 +1,45 @@
+cppHeaderExtensions {
+  h
+  hpp
+  inc
+}
+
+cppSrcExtensions {
+  cpp
+}
+
+otherExtensions {
+  java
+}
+
+genFileExclude {
+  gmock/
+  ni-libraries/
+  hal/src/main/native/athena/ctre/
+  hal/src/main/native/athena/frccansae/
+  hal/src/main/native/athena/visa/
+  hal/src/main/native/include/ctre/
+  simulation/JavaGazebo/build/classes/main/gazebo/msgs/
+  wpilibj/src/athena/cpp/nivision/
+  UsageReporting\.h$
+}
+
+modifiableFileExclude {
+  wpilibj/src/arm-linux-jni/
+  wpilibj/src/main/native/cpp/
+  \.patch$
+  \.png$
+  \.py$
+  \.so$
+}
+
+includeOtherLibs {
+  ^HAL/
+  ^llvm/
+  ^opencv2/
+  ^support/
+}
+
+includeProject {
+  ^ctre/
+}