增加图片下载授权判断，替换两个即将被废弃的canvas方法 #176
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1、增加图片下载授权判断，判断如下：如果受过权直接执行生成图片的方法，如果拒绝了授权会弹窗提示授权用户可点击确认跳进授权页面进行授权，如果没有进行过授权则会调用微信内置授权方法。
2、增加图片下载生成状态的isCreating变量，1为生成中，0为已结束，防止用户生成中重复调用。
3、替换两个即将被废弃的canvas方法