Fix all the compile warnings that occur on Mac.

(Except the OpenGL deprecation warning and some warnings coming from Boost.Process.)

src/scenedit/scen.actions.cpp

@@ -1793,7 +1793,7 @@ void handle_keystroke(sf::Event event) {
 	mouse_button_held = false;
 }
 
-bool handle_outdoor_sec_shift(int dx, int dy){
+static bool handle_outdoor_sec_shift(int dx, int dy){
 	if(editing_town) return false;
 	int new_x = cur_out.x + dx;
 	int new_y = cur_out.y + dy;

src/scenedit/scen.core.cpp

@@ -257,13 +257,6 @@ bool pick_string(std::string from_file, cDialog& parent, std::string result_fld,
 	return true;
 }
 
-static bool show_help(std::string from_file, cDialog& parent, pic_num_t pic){
-	StringList strings = *ResMgr::strings.get(from_file);
-	cThreeChoice help(strings,basic_buttons[1],pic,PIC_DLOG,&parent);
-	help.show();
-	return true;
-}
-
 static bool pick_ter_flag(cDialog& me, std::string id, eKeyMod) {
 	if(id == "editspec") {
 		int which_type = me["flag2"].getTextAsNum();

src/scenedit/scen.keydlgs.cpp

@@ -1310,6 +1310,7 @@ static bool edit_spec_enc_value(cDialog& me, std::string item_hit, node_stack_t&
 		case eSpecPicker::EVENT: store = choose_text_editable(scenario.evt_names, val, &me, "Select an event:"); break;
 		case eSpecPicker::ITEM_CLASS: store = choose_text_editable(scenario.ic_names, val, &me, "Select item class:"); break;
 		case eSpecPicker::JOB_BOARD: store = choose_text_editable(scenario.qb_names, val, &me, "Select a job board:"); break;
+		case eSpecPicker::POINTER: store = val; break; // TODO: Not implemented...
 		case eSpecPicker::NONE: return false;
 	}
 	me[field].setTextToNum(store);
@@ -1376,7 +1377,7 @@ bool edit_spec_enc(short which_node,short mode,cDialog* parent) {
 		"sdf1", "sdf2",
 	});
 	special["cancel"].attachClickHandler(std::bind(discard_spec_enc, _1, std::ref(edit_stack)));
-	special["node-help"].attachClickHandler([&edit_stack](cDialog& me, std::string item_hit, eKeyMod mods) {
+	special["node-help"].attachClickHandler([&edit_stack](cDialog& me, std::string, eKeyMod) {
 		eSpecType type = edit_stack.top().node.type;
 		const std::string& str = (*type).descr();
 		// TODO: This is the same dialog as give_help(), the only difference being that we don't have a string number!

src/scenedit/scen.main.cpp

@@ -430,7 +430,7 @@ void redraw_everything() {
 	restore_cursor();
 }
 
-void show_outdated_warning() {
+static void show_outdated_warning() {
 	std::string outdated_help1 = "The information in the following help window is extremely outdated! The most up-to-date documentation for OpenBoE is here:";
 	std::string outdated_help2 = "https://openboe.com/docs";