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[S2GRAPH-107] Improve code readability by using code formatter and code style inspector like Scalafmt and Scalastyle #109
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Issue: https://issues.apache.org/jira/browse/S2GRAPH-107
This PR has really big changes, but those are mostly related to code styles. In this PR, I changed level of some rules in scalastyle from warning to error. Many projects raise error rather than warning when scalastyle checker fails. In near future, we are able to change warning rule to raise error by do refactoring codebase. (I will create another issue to do refactoring our codebase according to some published scala best practice and design pattern.)
Tools related to code style which we use: