add recommended warning flags from Xcode 9

Base/Common.xcconfig

@@ -25,10 +25,16 @@ CLANG_ENABLE_MODULES = YES
 // Enable ARC
 CLANG_ENABLE_OBJC_ARC = YES
 
+// Warn about block captures of implicitly autoreleasing parameters.
+CLANG_WARN_BLOCK_CAPTURE_AUTORELEASING = YES
+
 // Warn about implicit conversions to boolean values that are suspicious.
 // For example, writing 'if (foo)' with 'foo' being the name a function will trigger a warning.
 CLANG_WARN_BOOL_CONVERSION = YES
 
+// Warn about suspicious uses of the comma operator.
+CLANG_WARN_COMMA = YES
+
 // Warn about implicit conversions of constant values that cause the constant value to change,
 // either through a loss of precision, or entirely in its meaning.
 CLANG_WARN_CONSTANT_CONVERSION = YES
@@ -65,9 +71,15 @@ CLANG_WARN_OBJC_REPEATED_USE_OF_WEAK = NO
 // Warn about classes that unintentionally do not subclass a root class (such as NSObject).
 CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR
 
+// Warn about ranged-based for loops.
+CLANG_WARN_RANGE_LOOP_ANALYSIS = YES
+
 // Whether to warn on suspicious implicit conversions
 CLANG_WARN_SUSPICIOUS_IMPLICIT_CONVERSION = YES
 
+// Warn about non-prototype declarations.
+CLANG_WARN_STRICT_PROTOTYPES = YES
+
 // Warn about incorrect uses of nullable values
 CLANG_WARN_NULLABLE_TO_NONNULL_CONVERSION = YES