Address some of the Resharper finds for Catch 1

Closes #957 as the other findings are mostly noise that is pointless
to fix in a branch that will be soon EoLd.

include/internal/catch_assertionresult.h

@@ -39,7 +39,7 @@ namespace Catch {
 
     struct AssertionInfo
     {
-        AssertionInfo() {}
+        AssertionInfo();
         AssertionInfo(  char const * _macroName,
                         SourceLineInfo const& _lineInfo,
                         char const * _capturedExpression,