Rename catch_common.hpp -> catch_source_line_info.hpp

Previous splitting of catch_common.hpp left it containing only one
actual thing, which is the `SourceLineInfo` type. Given that, there
is no reason to keep the old name.

Also found out that it was included in some places for no reason
(primarily Matchers).

src/catch2/internal/catch_test_case_tracker.hpp

@@ -9,7 +9,7 @@
 #define CATCH_TEST_CASE_TRACKER_HPP_INCLUDED
 
 #include <catch2/internal/catch_compiler_capabilities.hpp>
-#include <catch2/internal/catch_common.hpp>
+#include <catch2/internal/catch_source_line_info.hpp>
 
 #include <string>
 #include <vector>