Refactoring rrweb-player (#26)

* enable drag and drop in controller

* setup svelte v3 workflow and entry point

* add ts eslint config and do compatibility fallbacks in API

* rewrite replayer in svelte v3

* fix css import

* fix fullscreen API

tsconfig.json

@@ -0,0 +1,5 @@
+{
+  "extends": "@tsconfig/svelte/tsconfig.json",
+  "include": ["src/**/*"],
+  "exclude": ["node_modules/*", "__sapper__/*", "public/*"],
+}