feat: configure v8Version for snapshot tools (#503)

* Read v8 version from webpack.config.js

* use options instead of this.options

Author: vtrifonov

Diff for: plugins/NativeScriptSnapshotPlugin/index.js

@@ -64,6 +64,7 @@ exports.NativeScriptSnapshotPlugin = (function() {
             targetArchs: options.targetArchs,
             useLibs: options.useLibs,
             androidNdkPath: options.androidNdkPath,
+            v8Version: options.v8Version,
             tnsJavaClassesPath: join(preparedAppRootPath, "tns-java-classes.js")
         }).then(() => {
             // Make the original file empty

Diff for: plugins/NativeScriptSnapshotPlugin/options.json

@@ -25,6 +25,9 @@
     },
     "useLibs": {
       "type": "boolean"
+    },
+    "v8Version": {
+        "type": "string"
     }
   },
   "additionalProperties": false