- bugfix for deque with _size not being initialized

- wrote PrettyPrinter for deque

include/fennec/containers/deque.h

@@ -54,13 +54,15 @@ public:
 	deque()
 		: _alloc()
 		, _first(nullptr)
-		, _last(nullptr) {
+		, _last(nullptr)
+		, _size(0) {
 	}
 
 	deque(deque&& deque) noexcept
 		: _alloc(deque._alloc)
 		, _first(deque._first)
-		, _last(deque._last) {
+		, _last(deque._last)
+		, _size(deque._size) {
 		deque._first = nullptr;
 		deque._last  = nullptr;
 	}