Moved dynamic font list from static to lifetime controlled by main.

Means the list is destroyed before the OS object, allowing it the
opportunity to print an error if there are still dynamic font objects
hanging around.

scene/resources/dynamic_font.cpp

@@ -1029,7 +1029,7 @@ void DynamicFont::_bind_methods() {
 
 Mutex *DynamicFont::dynamic_font_mutex = NULL;
 
-SelfList<DynamicFont>::List DynamicFont::dynamic_fonts;
+SelfList<DynamicFont>::List *DynamicFont::dynamic_fonts = NULL;
 
 DynamicFont::DynamicFont() :
 		font_list(this) {
@@ -1041,29 +1041,31 @@ DynamicFont::DynamicFont() :
 	spacing_char = 0;
 	spacing_space = 0;
 	outline_color = Color(1, 1, 1);
-	if (dynamic_font_mutex)
+	if (dynamic_font_mutex) {
 		dynamic_font_mutex->lock();
-	dynamic_fonts.add(&font_list);
-	if (dynamic_font_mutex)
+		dynamic_fonts->add(&font_list);
 		dynamic_font_mutex->unlock();
+	}
 }
 
 DynamicFont::~DynamicFont() {
-
-	if (dynamic_font_mutex)
+	if (dynamic_font_mutex) {
 		dynamic_font_mutex->lock();
-	dynamic_fonts.remove(&font_list);
-	if (dynamic_font_mutex)
+		dynamic_fonts->remove(&font_list);
 		dynamic_font_mutex->unlock();
+	}
 }
 
 void DynamicFont::initialize_dynamic_fonts() {
+	dynamic_fonts = memnew(SelfList<DynamicFont>::List());
 	dynamic_font_mutex = Mutex::create();
 }
 
 void DynamicFont::finish_dynamic_fonts() {
 	memdelete(dynamic_font_mutex);
 	dynamic_font_mutex = NULL;
+	memdelete(dynamic_fonts);
+	dynamic_fonts = NULL;
 }
 
 void DynamicFont::update_oversampling() {
@@ -1073,7 +1075,7 @@ void DynamicFont::update_oversampling() {
 	if (dynamic_font_mutex)
 		dynamic_font_mutex->lock();
 
-	SelfList<DynamicFont> *E = dynamic_fonts.first();
+	SelfList<DynamicFont> *E = dynamic_fonts->first();
 	while (E) {
 
 		if (E->self()->data_at_size.is_valid()) {

scene/resources/dynamic_font.h

@@ -285,7 +285,7 @@ public:
 	SelfList<DynamicFont> font_list;
 
 	static Mutex *dynamic_font_mutex;
-	static SelfList<DynamicFont>::List dynamic_fonts;
+	static SelfList<DynamicFont>::List *dynamic_fonts;
 
 	static void initialize_dynamic_fonts();
 	static void finish_dynamic_fonts();