增强稳定性

-新增自定义剪切比例参数LFPhotoEditCropExtraAspectRatioAttributeName
-新增贴图移动时隐藏菜单栏
-新增贴图的默认边框距离为40，以便更好的双指操作

-调整贴图默认最小缩放率为0.3，文字采用固定缩放率，其它类型采用动态屏幕大小与贴图大小比例缩放率。
-调整文字输入界面的背景透明度
-调整贴图的按钮阴影效果

-兼容固定长宽比例时的旋转情况
-兼容iOS的安全区域预览

-修复没有记录旋转系数的初始值
-修复剪裁框缩放到最小时，会偏移出预览范围
-修复LFEasyNoticeBar没有释放导致崩溃的情况

LFMediaEditingController.podspec

@@ -12,6 +12,15 @@ s.requires_arc = true
 s.source_files = 'LFMediaEditingController/LFMediaEditingController/class/*.{h,m}'
 s.public_header_files = 'LFMediaEditingController/LFMediaEditingController/class/*.h'
 
+s.default_subspec = 'Core'
+
+s.subspec 'Core' do |core|
+
+core.dependency 'LFMediaEditingController/LFPhotoEditingController'
+core.dependency 'LFMediaEditingController/LFVideoEditingController'
+
+end
+
 # LFPhotoEditingController模块
 s.subspec 'LFPhotoEditingController' do |ss|
 ss.resources    = 'LFMediaEditingController/LFMediaEditingController/class/common/*.bundle'
@@ -34,7 +43,7 @@ end
 s.subspec 'LFVideoEditingController' do |ss|
 ss.resources    = 'LFMediaEditingController/LFMediaEditingController/class/common/*.bundle'
 ss.source_files = 'LFMediaEditingController/LFMediaEditingController/class/*.{h,m}','LFMediaEditingController/LFMediaEditingController/class/LFVideoEditingController/**/*.{h,m}','LFMediaEditingController/LFMediaEditingController/class/common/**/*.{h,m}'
-ss.public_header_files = 'LFMediaEditingController/LFMediaEditingController/class/*.h','LFMediaEditingController/LFMediaEditingController/class/LFVideoEditingController/controller/*.h','LFMediaEditingController/LFMediaEditingController/class/LFVideoEditingController/model/*.h','LFMediaEditingController/LFMediaEditingController/class/common/view/model/LFStickerContent.h'
+ss.public_header_files = 'LFMediaEditingController/LFMediaEditingController/class/*.h','LFMediaEditingController/LFMediaEditingController/class/LFVideoEditingController/controller/*.h','LFMediaEditingController/LFMediaEditingController/class/LFVideoEditingController/model/*.h','LFMediaEditingController/LFMediaEditingController/class/common/view/model/LFStickerContent.h','LFMediaEditingController/LFMediaEditingController/class/common/view/model/LFExtraAspectRatio.h','LFMediaEditingController/LFMediaEditingController/class/common/define/LFExtraAspectRatioProtocol.h'
 ss.dependency 'LFMediaEditingController/JRPickColorView'
 ss.dependency 'LFMediaEditingController/JRFilterBar'
 ss.dependency 'LFMediaEditingController/LFColorMatrix'