Implement kerning, ligatures, etc., and cleanup; in ios.

Implement hasGlyph ligature helper.

Export view property setters for:
 text: textLength, baselineShift, lengthAdjust, alignmentBaseline,
 textPath: side, method, midLine, spacing.

Attempt to fix alignmentBaseline and baselineShift,
but both properties are nil at all times, I must be missing something.

ios/Text/RNSVGTextPath.h

@@ -9,7 +9,6 @@
 #import <Foundation/Foundation.h>
 #import <CoreText/CoreText.h>
 #import "RNSVGText.h"
-#import "RNSVGBezierTransformer.h"
 
 @interface RNSVGTextPath : RNSVGText
 
@@ -21,6 +20,5 @@
 @property (nonatomic, strong) NSString *startOffset;
 
 - (RNSVGPath *)getPath;
-- (RNSVGBezierTransformer *)getBezierTransformer;
 
 @end