Nuke as many warnings as possible, and several globals as well

- Warnings completely suppressed for the included TinyXML and gzstream libraries
- Parentheses warnings are now errors, since there were several that looked like bugs
- Ditto for dangling else warnings

Some of these warnings were actually bugs:
- Town wandering monsters would have never spawned, because the code to do so was accidentally nested within a check for overall_mode == MODE_OUTDOORS
---> boe.monster.cpp, lines 105-137
- Monster's behaviour with respect to elemental fields did not correctly depend on their immunities (this is the same precedence issue Sylae messed up fixing in the Windows code)
---> boe.monsters.cpp, lines 345-359
- Display of damage blocked by armour appeared to be incorrect (needs verification)
---> boe.newgraph.cpp, line 1079
- Three-choice dialogs probably weren't dealing with unusual button types correctly, though that's a minor point since they aren't expected to use such buttons

osx/scenedit/scen.main.cpp

@@ -79,7 +79,7 @@ RECT right_sbar_rect;
 //
 
 //Changed to ISO C specified argument and return type.
-int main(int argc, char* argv[]) {
+int main(int, char* argv[]) {
 	init_menubar();
 	//outdoor_record_type dummy_outdoor, *store2;
 	
@@ -143,7 +143,6 @@ int main(int argc, char* argv[]) {
 //MW specified argument and return type.
 void Initialize(void) {
 	
-	char tit[256] = "  ";
 	
 	//
 	//	To make the Random sequences truly random, we need to make the seed start
@@ -183,7 +182,6 @@ void Initialize(void) {
 
 void Handle_One_Event() {
 	short chr,chr2;
-	long menu_choice;
 	
 	Handle_Update();
 	
@@ -208,7 +206,10 @@ void Handle_One_Event() {
 		case sf::Event::MouseButtonReleased:
 			mouse_button_held = false;
 			break;
-	} 
+			
+		default:
+			break;
+	}
 }
 
 void Handle_Update() {
@@ -494,7 +495,7 @@ void handle_monst_menu(int item_hit) {
 	mode_count = item_hit;
 }
 
-void handleUpdateWhileScrolling(volatile bool& doneScrolling) {
+static void handleUpdateWhileScrolling(volatile bool& doneScrolling) {
 	while(!doneScrolling) {
 		sf::sleep(sf::milliseconds(10));
 		// TODO: redraw_screen should probably take the argument specifying what to update
@@ -504,8 +505,6 @@ void handleUpdateWhileScrolling(volatile bool& doneScrolling) {
 }
 
 void Mouse_Pressed() {
-	short	the_part,content_part;
-	long menu_choice;
 	
 	location mousePos(event.mouseButton.x, event.mouseButton.y);
 	volatile bool doneScrolling = false;