Remove generic std::exception handlers, they don't seem to be adding value, and they hide useful info.

src/tools/contract.cpp

@@ -162,8 +162,3 @@ catch (const std::bad_alloc &e)
         << "Please provide more memory or consider using a larger swapfile";
     return EXIT_FAILURE;
 }
-catch (const std::exception &e)
-{
-    util::SimpleLogger().Write(logWARNING) << "[exception] " << e.what();
-    return EXIT_FAILURE;
-}