开放一些接口，添加上传base64的功能

zhaoxiaohao

2020-07-04 f396628c87b143f233503b23f36e4fc76df25ab2

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com\kidgrow\filecenter\service\impl\AbstractIFileService.class
com\kidgrow\filecenter\mapper\FileMapper.class
com\kidgrow\filecenter\util\FileUtil.class
com\kidgrow\filecenter\service\IFileService.class