Factorize ts version in main pckg.json

Viewer/package.json

@@ -33,7 +33,6 @@
         "html-loader": "^0.5.5",
         "json-loader": "^0.5.7",
         "ts-loader": "^4.4.0",
-        "typescript": "~3.0.1",
         "uglifyjs-webpack-plugin": "^1.2.2",
         "webpack": "^4.16.0",
         "webpack-cli": "^3.0.8",

Viewer/tests/package.json

@@ -11,7 +11,6 @@
     "devDependencies": {
         "@types/mocha": "2.2.46",
         "@types/chai": "^4.1.0",
-        "@types/sinon": "^4.1.3",
-        "typescript": "~3.0.1"
+        "@types/sinon": "^4.1.3"
     }
 }