chore(architecture): deprecate some of the new architecture

In order to use Dependency Injection, we need to deprecate old classes
which aren't suitable for it, and which will be replaced by other ones
in followup commits.

Bug: twpowertools:226
Change-Id: I232bd9f036b6fb540eba27d7586d8054ce3de789
diff --git a/src/common/architecture/features/Feature.ts b/src/common/architecture/features/Feature.ts
index 76f5990..5f0cfa0 100644
--- a/src/common/architecture/features/Feature.ts
+++ b/src/common/architecture/features/Feature.ts
@@ -1,6 +1,9 @@
 import { OptionCodename } from '../../options/optionsPrototype';
 import Script, { ConcreteScript } from '../scripts/Script';
 
+/**
+ * @deprecated
+ */
 export default abstract class Feature {
   /**
    * Internal codename used for the feature.