Add braces to C++ single-line loops and conditionals (NFC) (#2973)

This makes code easier to read and more consistent between C++ and Java.
Also update clang-format settings to always add a line break (even if no braces are used).

wpilibcIntegrationTests/src/main/native/cpp/TestEnvironment.cpp

@@ -23,7 +23,9 @@ class TestEnvironment : public testing::Environment {
   void SetUp() override {
     /* Only set up once.  This allows gtest_repeat to be used to
             automatically repeat tests. */
-    if (m_alreadySetUp) return;
+    if (m_alreadySetUp) {
+      return;
+    }
     m_alreadySetUp = true;
 
     if (!HAL_Initialize(500, 0)) {