TSLint → ESLint (#21006)

* Alphabetized tslint and tsconfig files

* Optimized tsconfig files

* Optimized editorconfig & prettier config files

… to reduce redundancy

* Switched to @grafana/tsconfig

… and:
* de-duped options
* removed options with default values

* Fixed nasty issue with types for nested slate-react

* Replaced TSLint with ESLint

* TSLint disables → ESLint disables

… also JSHint removals, which haven’t had an affect since it was replaced with TSLint.

* Compliances for ESLint, Prettier and TypeScript

* Updated lockfile

packages/grafana-runtime/package.json

@@ -14,7 +14,7 @@
   },
   "main": "src/index.ts",
   "scripts": {
-    "tslint": "tslint -c tslint.json --project tsconfig.json",
+    "lint": "eslint src/ --ext=.js,.ts,.tsx",
     "typecheck": "tsc --noEmit",
     "clean": "rimraf ./dist ./compiled",
     "bundle": "rollup -c rollup.config.ts",
@@ -27,6 +27,7 @@
     "systemjs-plugin-css": "0.1.37"
   },
   "devDependencies": {
+    "@grafana/tsconfig": "^1.0.0-rc1",
     "@types/systemjs": "^0.20.6",
     "lodash": "4.17.15",
     "pretty-format": "24.9.0",