:zap: refactor：优化默认的预览绘制逻辑，当预览分辨率与控件大小存在差异时将预览尽可能绘制在正中央

:recycle: refactor: 更新Demo调用示例

:sparkles: feat: 预览帧图像支持设置Bitmap格式

:pencil: docs: 更新说明文档

:building_construction: build: 更新gradle配置

:building_construction: build: 增加jitpack配置

:recycle: refactor: 优化预览绘制接口drawBitmap形参避免冗余

:art: style: 更新接口注释说明

:recycle: refactor:优化USB摄像头预览帧最佳分辨率选择逻辑

:art: style: remove unused statements

:art: chore: remove the unused MainActivity and its layout file

:building_construction: build: differentiate the demo package structure by productFlavor

:pencil: docs: update README.md

:sparkles: feat: support USB camera

:building_construction: build: add productFlavors