Track modifier state in the main loops

Really fixes #291

src/game/boe.main.cpp

@@ -31,6 +31,7 @@
 #include "dialogxml/widgets/scrollbar.hpp"
 #include "boe.menus.hpp"
 #include "tools/cursors.hpp"
+#include "tools/keymods.hpp"
 #include "tools/prefs.hpp"
 #include "dialogxml/widgets/button.hpp"
 #include "tools/enum_map.hpp"
@@ -323,6 +324,9 @@ void handle_one_event(const sf::Event& event) {
 
 	// What does this do and should it be here?
 	clear_sound_memory();
+	
+	// If it's just a modifier key, update the state
+	if(kb.handleModifier(event)) return;
 
 	// Check if any of the event listeners want this event.
 	for(auto & listener : event_listeners) {

src/pcedit/pc.main.cpp

@@ -18,6 +18,7 @@
 #include "dialogxml/dialogs/strchoice.hpp"
 #include "fileio/fileio.hpp"
 #include "pc.menus.hpp"
+#include "tools/keymods.hpp"
 #include "tools/winutil.hpp"
 #include "tools/cursors.hpp"
 #include "fileio/resmgr/res_dialog.hpp"
@@ -190,6 +191,9 @@ void handle_events() {
 
 void handle_one_event (const sf::Event& event) {
 	
+	// If it's just a modifier key, update the state
+	if(kb.handleModifier(event)) return;
+	
 	// Check if the menubar wants to handle this event.
 	if(menuBarProcessEvent(event)) return;
 	

src/scenedit/scen.main.cpp

@@ -29,6 +29,7 @@
 #include "tools/framerate_limiter.hpp"
 #include "tools/event_listener.hpp"
 #include "tools/drawable_manager.hpp"
+#include "tools/keymods.hpp"
 
 #ifdef __APPLE__
 short menuChoiceId=-1;
@@ -251,6 +252,9 @@ void handle_events() {
 
 void handle_one_event(const sf::Event& event) {
 	
+	// If it's just a modifier key, update the state
+	if(kb.handleModifier(event)) return;
+	
 	// Check if any of the event listeners want this event.
 	for (auto& listener : event_listeners) {
 		if(listener.second->handle_event(event)) return;