OAuth Support (#53)

Rips out the old auth method, adds OAuth support. Fixes #51.

Tested Platforms:
- [x] Linux
    - [x] Flatpak
    - [x] Native (Nix)
- [x] Android
- [ ] Windows
- [ ] MacOS

Reviewed-on: Nexus/nexus#53

windows/flutter/generated_plugin_registrant.cc

@@ -6,6 +6,7 @@
 
 #include "generated_plugin_registrant.h"
 
+#include <app_links/app_links_plugin_c_api.h>
 #include <dynamic_color/dynamic_color_plugin_c_api.h>
 #include <file_selector_windows/file_selector_windows.h>
 #include <media_kit_libs_windows_video/media_kit_libs_windows_video_plugin_c_api.h>
@@ -15,6 +16,8 @@
 #include <window_manager/window_manager_plugin.h>
 
 void RegisterPlugins(flutter::PluginRegistry* registry) {
+  AppLinksPluginCApiRegisterWithRegistrar(
+      registry->GetRegistrarForPlugin("AppLinksPluginCApi"));
   DynamicColorPluginCApiRegisterWithRegistrar(
       registry->GetRegistrarForPlugin("DynamicColorPluginCApi"));
   FileSelectorWindowsRegisterWithRegistrar(

windows/flutter/generated_plugins.cmake

@@ -3,6 +3,7 @@
 #
 
 list(APPEND FLUTTER_PLUGIN_LIST
+  app_links
   dynamic_color
   file_selector_windows
   media_kit_libs_windows_video