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).

cscore/src/dev/native/cpp/main.cpp

@@ -6,4 +6,6 @@
 
 #include "cscore.h"
 
-int main() { std::cout << cs::GetHostname() << std::endl; }
+int main() {
+  std::cout << cs::GetHostname() << std::endl;
+}