chore(tsickle): add @Annotation annotations

This lets users continue using runtime-sideeffect Decorators if they choose,
only down-leveling the marked ones to Annotations.

Also remove the "skipTemplateCodegen" option, which is no longer needed
since Angular compiles with tsc-wrapped rather than ngc. The former doesn't
include any codegen.

tools/@angular/tsc-wrapped/package.json

@@ -11,7 +11,7 @@
   "license": "MIT",
   "repository": {"type":"git","url":"https://github.com/angular/angular.git"},
   "dependencies": {
-    "tsickle": "0.1.4"
+    "tsickle": "0.1.6"
   },
   "peerDependencies": {
     "typescript": "^1.9.0-dev"