Migrate TSLint to ESLint

[gemmaro]

fix #49

Migrate to ESLint from TSLint.

• Replace with ESLint commands in npm scripts.
• Uninstall TSLint and install ESLint and additional packages as Shogi.js.
• ESLint config is cited from the Shogi.js one.
• Ignore .github, test directory in npm ignore file as Shogi.js
• Add .prettierignore. Note that src/__tests__/jkfplayerTest.ts is temporary ignored, since the jest run somehow fails if it is linted.
• Add .prettierrc.json as Shogi.js.
• Update README.md link from TSLint to ESLint.
• Lint and format some files according to ESLint and Prettier rules.
  • Some rules are ignored by inserting ESLint line comments.
• Add a test case since the coverage check fails.

[na2hiro]

Thank you for migrating to ESLint!