Merge branch 'tw_maven_release' into 'master'

.gitignore

.gitlab-ci.yml

pom.xml

src/main/java/io/github/MigadaTang/Attribute.java

src/main/java/io/github/MigadaTang/ER.java

src/main/java/io/github/MigadaTang/Entity.java

src/main/java/io/github/MigadaTang/LayoutInfo.java

src/main/java/io/github/MigadaTang/Relationship.java

src/main/java/io/github/MigadaTang/Schema.java

src/main/java/io/github/MigadaTang/Trans.java

src/main/java/io/github/MigadaTang/common/Cardinality.java

.../github/MigadaTang/common/CardinalityEnumTypeHandler.java

src/main/java/io/github/MigadaTang/common/DataType.java

...main/java/io/github/MigadaTang/common/RelatedObjType.java

...a/io/github/MigadaTang/common/RelationshipSerializer.java

src/main/java/io/github/MigadaTang/common/ResultState.java

...ain/java/io/github/MigadaTang/common/ResultStateCode.java

.../java/io/github/MigadaTang/common/SchemaDeserializer.java

src/main/java/io/github/MigadaTang/dao/AttributeMapper.java

src/main/java/io/github/MigadaTang/dao/EntityMapper.java