Renderers are now packages, not features. (#387)

* feat: use synchronous router design

* feat: function to get router out of dom

* chore: restructure workspace to use renderers as packages, not features

examples/filedragdrop.rs

@@ -1,7 +1,7 @@
 use dioxus::prelude::*;
 
 fn main() {
-    dioxus::desktop::launch_with_props(app, (), |c| {
+    dioxus_desktop::launch_with_props(app, (), |c| {
         c.with_file_drop_handler(|_w, e| {
             println!("{:?}", e);
             true