build: publish tree of files rather than FESMs (#18541)

* Remove now unnecessary portions of build.
* Add a compilePackageES5 method to build ES5 from sources
* Rework all package.json and rollup config files to new format
* Remove "extends" from tsconfig-build.json files and fixup compilation roots

PR Close #18541

package.json

@@ -87,9 +87,10 @@
     "react": "^0.14.0",
     "rewire": "^2.3.3",
     "rho": "^0.3.0",
-    "rollup": "^0.41.6",
-    "rollup-plugin-commonjs": "^5.0.5",
+    "rollup": "^0.47.4",
+    "rollup-plugin-commonjs": "^8.1.0",
     "rollup-plugin-node-resolve": "^3.0.0",
+    "rollup-plugin-sourcemaps": "^0.4.2",
     "selenium-webdriver": "^2.53.3",
     "semver": "^5.1.0",
     "sorcery": "^0.10.0",
@@ -97,7 +98,7 @@
     "source-map-support": "^0.4.2",
     "systemjs": "0.18.10",
     "ts-api-guardian": "^0.2.2",
-    "tsickle": "^0.23.4",
+    "tsickle": "^0.23.6",
     "tslint": "^4.1.1",
     "tslint-eslint-rules": "^3.1.0",
     "typescript": "^2.3.4",