Fix several more warnings

- As a side-effect, weapons with key skills other than the conventional three (edged, bashing, pole) are now fully supported (though the scenario editor UI doesn't yet support them)

src/dialogxml/dialog.cpp

@@ -175,7 +175,7 @@ template<> pair<string,cPict*> cDialog::parse(Element& who /*pict*/){
 	return p;
 }
 
-string dlogStringFilter(string toFilter) {
+static string dlogStringFilter(string toFilter) {
 	string filtered;
 	bool found_nl = false;
 	for(char c : toFilter) {

src/dialogxml/field.cpp

@@ -357,6 +357,7 @@ void cTextField::handleInput(cKey key) {
 		contents.insert(contents.begin() + insertionPoint, char(key.c));
 		selectionPoint = ++insertionPoint;
 	} else switch(key.k) {
+		case key_enter: break; // Shouldn't be receiving this anyway
 			// TODO: Implement all the other special keys
 		case key_left: case key_word_left:
 			if(haveSelection && !select) {

src/dialogxml/stack.cpp

@@ -13,7 +13,7 @@ void cStack::attachClickHandler(click_callback_t f) throw(xHandlerNotSupported)
 	onClick = f;
 }
 
-void cStack::attachFocusHandler(focus_callback_t f) throw(xHandlerNotSupported) {
+void cStack::attachFocusHandler(focus_callback_t) throw(xHandlerNotSupported) {
 	throw xHandlerNotSupported(true);
 }