ItemRepository

由于自用 SaveItem 有各种各样的问题，一气之下重写了一下

Name		Name	Last commit message	Last commit date
Latest commit History 4 Commits
gradle/wrapper		gradle/wrapper
src/main		src/main
.gitignore		.gitignore
README.md		README.md
build.gradle		build.gradle
gradle.properties		gradle.properties
gradlew		gradlew
gradlew.bat		gradlew.bat
settings.gradle		settings.gradle

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