* Fix field initialization order
* Reduce dependencies in objc_compatibility_apple_test
This makes it possible to build and test util without having to build
everything
* Add a lint check for CMake files
* Find XCTest, if available
* Fix CMakeLists.txt to include all sources
* Fix test flake in local store tests
This doesn't affect production because we always set the additional
references pointer there, but it's technically optional and some tests
don't do this.
