refactor shape elements add responder system.

refactor shape elements add responder system.
Just iOS.

ios/Text/RNSVGGlyphCache.h

@@ -0,0 +1,27 @@
+/**
+ * Copyright (c) 2015-present, Horcrux.
+ * All rights reserved.
+ *
+ * This source code is licensed under the MIT-style license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+// This implements a very simple glyph cache.
+// It maps from CTFontRef to CGGlyph to CGPathRef in order to reuse glyphs.
+// It does NOT try to retain the keys that are used (CTFontRef or CGGlyph)
+// but that is not an issue with respect to how it is used by this sample.
+
+#import <Foundation/Foundation.h>
+#import <CoreText/CoreText.h>
+#import "RNSVGRenderable.h"
+
+@interface RNSVGGlyphCache : NSObject
+{
+    CFMutableDictionaryRef cache;
+}
+
+- (id)init;
+- (CGPathRef)pathForGlyph:(CGGlyph)glyph fromFont:(CTFontRef)font;
+
+
+@end