v3.2.7.40_release_20220215

主要修改内容：
（1）完善文本结尾含有换行符时bounds计算完善
（2）修复区间判断，localFrame相对的是composition时间而不是layer durartion
（3）含有TrackMatte的 Layer bounds获取完善
（4）dropshadow效果完善
（5）PAGView播放结束后支持play从头播放，PAGView setProgress 去除flush操作
（6）iOS端制品库切换至xcframwork，增加静态库版本

Main revisions:
（1）Improving Bounds Calculation when Text Ends with Line Breaks
（2）Fix interval judgment. LocalFrame is relative to composition time rather than layer duration
（3）Improve Layer bounds containing TrackMatte
（4）Improve dropshadow effect
（5）PAGView supports play from scratch after playback, and PAGView setProgress removes flush operation
（6）Switch the iOS prebuilt library to xcframwork and add a static library version