Packer (#172)

* introduce pako and add general packer interface

* add tests for packer

* use function API instead of class API for better tree shaking support

* refcatoring the rollup bundle config

src/declarations/pako/index.d.ts

@@ -0,0 +1,12 @@
+declare module 'pako/dist/pako_deflate' {
+  export const deflate: any;
+}
+
+declare module 'pako/dist/pako_inflate' {
+  export const inflate: any;
+}
+
+declare module 'pako' {
+  export const deflate: any;
+  export const inflate: any;
+}