Tweak console text colours for better visibility

Avoid using forced black for regular text, since this is unreadable in dark
themes. Use wxNullColour for regular text, which uses the appropriate theme
colour, and a slightly dark orange for warning text, which appears to be
visible with both a light and a dark background.

libs/wxutil/ConsoleView.cpp

@@ -10,8 +10,8 @@ namespace wxutil
 ConsoleView::ConsoleView(wxWindow* parent) :
 	wxTextCtrl(parent, wxID_ANY, "", wxDefaultPosition, wxDefaultSize, wxTE_MULTILINE|wxTE_RICH2|wxTE_READONLY),
 	_errorAttr(*wxRED),
-	_warningAttr(wxColour(128, 128, 0)),
-	_standardAttr(*wxBLACK)
+	_warningAttr(wxColour(255, 96, 0)),
+	_standardAttr(wxNullColour)
 {
     _lineBuffer.reserve(512);
 }
@@ -54,7 +54,7 @@ void ConsoleView::flushLine()
 
 void ConsoleView::onIdle()
 {
-    // Idle events occur in the main thread - prevent interrupting 
+    // Idle events occur in the main thread - prevent interrupting
     // threads in the middle of a line
     std::lock_guard<std::mutex> idleLock(GlobalRadiantCore().getLogWriter().getStreamLock());
 
@@ -87,7 +87,7 @@ void ConsoleView::onIdle()
         // Insert at the end of the text buffer
         AppendText(pair.second);
     }
-	
+
     _lineBuffer.clear();
 
     // Scroll to bottom