ios: update to Xcode 5 and Swift 5

ios/app/app.xcodeproj/project.pbxproj

 		83CBB9F71A601CBA00E9B192 /* Project object */ = {
 			isa = PBXProject;
 			attributes = {
-				LastUpgradeCheck = 1000;
+				LastUpgradeCheck = 1020;
 				ORGANIZATIONNAME = Facebook;
 				TargetAttributes = {
 					13B07F861A680F5B00A75B9A = {
 			};
 			buildConfigurationList = 83CBB9FA1A601CBA00E9B192 /* Build configuration list for PBXProject "app" */;
 			compatibilityVersion = "Xcode 3.2";
-			developmentRegion = English;
+			developmentRegion = en;
 			hasScannedForEncodings = 0;
 			knownRegions = (
 				en,
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				ALWAYS_SEARCH_USER_PATHS = NO;
+				CLANG_ANALYZER_LOCALIZABILITY_NONLOCALIZED = YES;
 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
 				CLANG_CXX_LIBRARY = "libc++";
 				CLANG_ENABLE_MODULES = YES;
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				ALWAYS_SEARCH_USER_PATHS = NO;
+				CLANG_ANALYZER_LOCALIZABILITY_NONLOCALIZED = YES;
 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
 				CLANG_CXX_LIBRARY = "libc++";
 				CLANG_ENABLE_MODULES = YES;

ios/app/app.xcodeproj/xcshareddata/xcschemes/jitsi-meet.xcscheme

 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "1000"
+   LastUpgradeVersion = "1020"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "NO"

ios/sdk/sdk.xcodeproj/project.pbxproj

 		0BD906DC1EC0C00300C8C18E /* Project object */ = {
 			isa = PBXProject;
 			attributes = {
-				LastUpgradeCheck = 1000;
+				LastUpgradeCheck = 1020;
 				ORGANIZATIONNAME = Jitsi;
 				TargetAttributes = {
 					0BD906E41EC0C00300C8C18E = {
 			};
 			buildConfigurationList = 0BD906DF1EC0C00300C8C18E /* Build configuration list for PBXProject "sdk" */;
 			compatibilityVersion = "Xcode 3.2";
-			developmentRegion = English;
+			developmentRegion = en;
 			hasScannedForEncodings = 0;
 			knownRegions = (
 				en,
+				Base,
 			);
 			mainGroup = 0BD906DB1EC0C00300C8C18E;
 			productRefGroup = 0BD906E61EC0C00300C8C18E /* Products */;
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				ALWAYS_SEARCH_USER_PATHS = NO;
+				CLANG_ANALYZER_LOCALIZABILITY_NONLOCALIZED = YES;
 				CLANG_ANALYZER_NONNULL = YES;
 				CLANG_ANALYZER_NUMBER_OBJECT_CONVERSION = YES_AGGRESSIVE;
 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				ALWAYS_SEARCH_USER_PATHS = NO;
+				CLANG_ANALYZER_LOCALIZABILITY_NONLOCALIZED = YES;
 				CLANG_ANALYZER_NONNULL = YES;
 				CLANG_ANALYZER_NUMBER_OBJECT_CONVERSION = YES_AGGRESSIVE;
 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
 				SKIP_INSTALL = YES;
 				SWIFT_OBJC_BRIDGING_HEADER = "";
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
-				SWIFT_SWIFT3_OBJC_INFERENCE = On;
-				SWIFT_VERSION = 4.2;
+				SWIFT_SWIFT3_OBJC_INFERENCE = Default;
+				SWIFT_VERSION = 5.0;
 			};
 			name = Debug;
 		};
 				PROVISIONING_PROFILE_SPECIFIER = "";
 				SKIP_INSTALL = YES;
 				SWIFT_OBJC_BRIDGING_HEADER = "";
-				SWIFT_SWIFT3_OBJC_INFERENCE = On;
-				SWIFT_VERSION = 4.2;
+				SWIFT_SWIFT3_OBJC_INFERENCE = Default;
+				SWIFT_VERSION = 5.0;
 			};
 			name = Release;
 		};

ios/sdk/sdk.xcodeproj/xcshareddata/xcschemes/JitsiMeet.xcscheme

 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "1000"
+   LastUpgradeVersion = "1020"
    version = "1.7">
    <BuildAction
       parallelizeBuildables = "YES"

ios/sdk/src/callkit/JMCallKitEmitter.swift

 
 fileprivate struct JMCallKitEventListenerWrapper: Hashable {
 
-    public var hashValue: Int
-
     internal weak var listener: JMCallKitListener?
 
     public init(listener: JMCallKitListener) {
         self.listener = listener
-        self.hashValue = listener.hash
     }
 
     public static func ==(lhs: JMCallKitEventListenerWrapper,
         // necessarily equal to each other."
         return lhs.hashValue == rhs.hashValue
     }
+
+    func hash(into hasher: inout Hasher) {
+        hasher.combine(self.listener?.hash)
+    }
 }