Improve source output

* Though the exact error may be unknown, as far as the user is concerned
"unknown error" is confusing; specify at the least that it is definitely a
source error.
* Put newlines in the proper locations so that the end of the stack trace and
the beginning of the summary are not on the same line.

Core/CLI/src/cli_CommandLineInterface.cpp

@@ -442,6 +442,7 @@ bool CommandLineInterface::SetError(const std::string& error)
             m_Result << std::endl;
         }
     m_Result << error;
+    m_Result << std::endl;
     m_LastError = error;
     return false;
 }
@@ -454,6 +455,7 @@ bool CommandLineInterface::AppendError(const std::string& error)
             m_Result << std::endl;
         }
     m_Result << error;
+    m_Result << std::endl;
     m_LastError.append(error);
     return false;
 }

Core/CLI/src/cli_load_save.cpp

@@ -918,7 +918,7 @@ bool CommandLineInterface::Source(const char* buffer, bool printFileStack)
     if (printFileStack)
     {
         std::string temp;
-        sourceError.append("\n\t");
+        sourceError.append("\t");
         sourceError.append(m_SourceFileStack.top());
         sourceError.append(":");
         sourceError.append(to_string(line, temp));
@@ -927,10 +927,11 @@ bool CommandLineInterface::Source(const char* buffer, bool printFileStack)
             sourceError.append(":");
             sourceError.append(to_string(line, temp));
         }
+        sourceError.append("\n");
     }
     if (sourceError.empty()) {
         // It's important that we don't return an empty error string, as that will be interpreted as success
-        sourceError = "Unknown error";
+        sourceError = "Error while sourcing file";
     }
     AppendError(sourceError);
     return false;