Update fmt lib, add recast, wip on recast pathfinder interface (broken atm)

libs/format/test/gtest-extra.h

@@ -29,7 +29,7 @@
 #define FMT_GTEST_EXTRA_H_
 
 #include <string>
-#include <gtest/gtest.h>
+#include <gmock/gmock.h>
 
 #include "fmt/format.h"
 
@@ -172,4 +172,10 @@ std::string read(fmt::File &f, std::size_t count);
 
 #endif  // FMT_USE_FILE_DESCRIPTORS
 
+template <typename Mock>
+struct ScopedMock : testing::StrictMock<Mock> {
+  ScopedMock() { Mock::instance = this; }
+  ~ScopedMock() { Mock::instance = 0; }
+};
+
 #endif  // FMT_GTEST_EXTRA_H_