Update project, setting minimum OS version to macOS 10.13.

Author: mikepj

XRG.xcodeproj/project.pbxproj

@@ -3,7 +3,7 @@
 	archiveVersion = 1;
 	classes = {
 	};
-	objectVersion = 46;
+	objectVersion = 54;
 	objects = {
 
 /* Begin PBXBuildFile section */
@@ -424,8 +424,9 @@
 		273ECE5C15740DE700E65D82 /* Project object */ = {
 			isa = PBXProject;
 			attributes = {
+				BuildIndependentTargetsInParallel = YES;
 				CLASSPREFIX = XRG;
-				LastUpgradeCheck = 1210;
+				LastUpgradeCheck = 1500;
 				ORGANIZATIONNAME = "Gaucho Software";
 				TargetAttributes = {
 					273ECE6415740DE700E65D82 = {
@@ -556,8 +557,10 @@
 				CLANG_WARN_UNREACHABLE_CODE = YES;
 				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
 				COPY_PHASE_STRIP = NO;
+				DEAD_CODE_STRIPPING = YES;
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
 				ENABLE_TESTABILITY = YES;
+				ENABLE_USER_SCRIPT_SANDBOXING = YES;
 				GCC_C_LANGUAGE_STANDARD = gnu99;
 				GCC_DYNAMIC_NO_PIC = NO;
 				GCC_ENABLE_OBJC_EXCEPTIONS = YES;
@@ -605,8 +608,10 @@
 				CLANG_WARN_UNREACHABLE_CODE = YES;
 				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
 				COPY_PHASE_STRIP = YES;
+				DEAD_CODE_STRIPPING = YES;
 				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
+				ENABLE_USER_SCRIPT_SANDBOXING = YES;
 				GCC_C_LANGUAGE_STANDARD = gnu99;
 				GCC_ENABLE_OBJC_EXCEPTIONS = YES;
 				GCC_NO_COMMON_BLOCKS = YES;
@@ -629,13 +634,14 @@
 				CODE_SIGN_IDENTITY = "Mac Developer";
 				COMBINE_HIDPI_IMAGES = YES;
 				CURRENT_PROJECT_VERSION = 3.2.1;
+				DEAD_CODE_STRIPPING = YES;
 				DEVELOPMENT_TEAM = 28EXY66HMA;
 				ENABLE_HARDENED_RUNTIME = YES;
 				GCC_PRECOMPILE_PREFIX_HEADER = YES;
 				GCC_PREFIX_HEADER = "Other Sources/XRG-Prefix.pch";
 				GCC_VERSION = "";
 				INFOPLIST_FILE = "XRG-Info.plist";
-				MACOSX_DEPLOYMENT_TARGET = 10.9;
+				MACOSX_DEPLOYMENT_TARGET = 10.13;
 				MARKETING_VERSION = 3.2.1;
 				PRODUCT_BUNDLE_IDENTIFIER = "com.piatekjimenez.${PRODUCT_NAME:rfc1034identifier}";
 				PRODUCT_NAME = "$(TARGET_NAME)";
@@ -650,13 +656,14 @@
 				CODE_SIGN_IDENTITY = "Mac Developer";
 				COMBINE_HIDPI_IMAGES = YES;
 				CURRENT_PROJECT_VERSION = 3.2.1;
+				DEAD_CODE_STRIPPING = YES;
 				DEVELOPMENT_TEAM = 28EXY66HMA;
 				ENABLE_HARDENED_RUNTIME = YES;
 				GCC_PRECOMPILE_PREFIX_HEADER = YES;
 				GCC_PREFIX_HEADER = "Other Sources/XRG-Prefix.pch";
 				GCC_VERSION = "";
 				INFOPLIST_FILE = "XRG-Info.plist";
-				MACOSX_DEPLOYMENT_TARGET = 10.9;
+				MACOSX_DEPLOYMENT_TARGET = 10.13;
 				MARKETING_VERSION = 3.2.1;
 				PRODUCT_BUNDLE_IDENTIFIER = "com.piatekjimenez.${PRODUCT_NAME:rfc1034identifier}";
 				PRODUCT_NAME = "$(TARGET_NAME)";