Improved npm scripts

Added a lint check before the publishing step to make to ensure that all rules for code quality are followed.

package.json

@@ -8,14 +8,16 @@
         "vscode": "^1.22.1"
     },
     "scripts": {
-        "vscode:prepublish": "webpack --mode production",
-        "compile": "webpack --mode none",
-        "watch": "webpack --mode none --watch",
-        "test-compile": "tsc -p ./",
+        "build": "npm run compile:dev",
+        "compile": "webpack --mode production",
+        "compile:dev": "webpack --mode none",
+        "compile:watch": "webpack --mode none --watch",
+        "lint": "tslint ./src/**/*.ts -t stylish",
+        "postinstall": "node ./node_modules/vscode/bin/install",
         "pretest": "npm run test-compile",
         "test": "node ./node_modules/vscode/bin/test",
-        "postinstall": "node ./node_modules/vscode/bin/install",
-        "lint": "tslint ./src/**/*.ts -t stylish"
+        "test-compile": "tsc -p ./",
+        "vscode:prepublish": "npm run lint && npm run compile"
     },
     "categories": [
         "Other"
@@ -143,11 +145,12 @@
     "devDependencies": {
         "@types/mocha": "^5.2.6",
         "@types/node": "^11.10.4",
+        "clean-webpack-plugin": "^2.0.1",
         "ts-loader": "^5.3.3",
         "tslint": "^5.13.1",
         "typescript": "^3.3.3333",
         "vscode": "^1.1.30",
         "webpack": "^4.29.6",
         "webpack-cli": "^3.2.3"
     }
-}
+}