Rework how weak tracking is performed

Due to how the Objective C runtime works, if an object is in the middle of deallocation, a weak store should not be attempted becase the object’s weak table is already freed. Instead, I am now using a proxy objects, which is set as an associated object in question. If the object is in the middle of deallocation, the associated object will release at the end of deallocation.
Closes #428

detox/ios/Detox/GREYIdlingResourcePrettyPrint.m

@@ -9,13 +9,39 @@
 #import "GREYIdlingResourcePrettyPrint.h"
 @import ObjectiveC;
 
+@interface __DTXDeallocSafeProxy : NSObject
+
+@property (nonatomic, unsafe_unretained) id object;
+
+@end
+
+@implementation __DTXDeallocSafeProxy
+
+- (void)dealloc
+{
+	self.object = nil;
+}
+
+- (instancetype)initWithObject:(id)object
+{
+	self = [super init];
+	if(self)
+	{
+		object = object;
+		objc_setAssociatedObject(object, "__DTXDeallocSafeProxy", self, OBJC_ASSOCIATION_RETAIN);
+	}
+	return self;
+}
+
+@end
+
 @interface NSMapTable<KeyType, ObjectType> ()
 
 - (NSArray<ObjectType>*)allValues;
 
 @end
 
-static NSMapTable<GREYAppStateTrackerObject*, id>* __tarckedObjectsMapping;
+static NSMapTable<GREYAppStateTrackerObject*, __DTXDeallocSafeProxy*>* __tarckedObjectsMapping;
 
 @interface GREYAppStateTracker (PrettyPrint) @end
 
@@ -25,7 +51,8 @@ - (GREYAppStateTrackerObject *)_pp__trackState:(GREYAppState)state forObject:(id
 {
 	GREYAppStateTrackerObject* rv = [self _pp__trackState:state forObject:element];
 
-	[__tarckedObjectsMapping setObject:element forKey:rv];
+	__DTXDeallocSafeProxy* proxy = [[__DTXDeallocSafeProxy alloc] initWithObject:element];
+	[__tarckedObjectsMapping setObject:proxy forKey:rv];
 
 	return rv;
 }
@@ -125,17 +152,24 @@ + (void)load
 	rv[@"appState"] = stateString;
 
 
-	NSArray* allElements = __tarckedObjectsMapping.allValues;
+	NSArray<__DTXDeallocSafeProxy*>* allElements = __tarckedObjectsMapping.allValues;
 
 	NSMutableArray* elems = [NSMutableArray new];
 	NSMutableArray* URLs = [NSMutableArray new];
 
-	[allElements enumerateObjectsUsingBlock:^(id  _Nonnull actualElement, NSUInteger idx, BOOL * _Nonnull stop) {
-		[elems addObject:[actualElement description]];
+	[allElements enumerateObjectsUsingBlock:^(__DTXDeallocSafeProxy* _Nonnull actualElement, NSUInteger idx, BOOL * _Nonnull stop) {
+		id actualObject = actualElement.object;
+		if(actualObject == nil)
+		{
+			NSLog(@"");
+			return;
+		}
+
+		[elems addObject:[actualObject description]];
 
-		if([actualElement isKindOfClass:[NSURLSessionTask class]])
+		if([actualObject isKindOfClass:[NSURLSessionTask class]])
 		{
-			[URLs addObject:[(NSURLSessionTask*)actualElement originalRequest].URL.absoluteString];
+			[URLs addObject:[(NSURLSessionTask*)actualObject originalRequest].URL.absoluteString];
 		}
 	}];