feat(Module): External modules support (#462)

* feat(Modules): Created definition for external modules
* feat(External Modules): Added database definitions, base route definition, added to exported config
* tweak(Settings): Updated help information message for external modules
* feat(Settings): Ability to add new external module
* feat(External Modules): Implemented external module list
* feat(Settings): Ability to modify and delete external modules
* feat(Settings): Add hints to external module host dialog
* chore(release): Updated CHANGELOG.md

lib/modules/external_modules/core.dart

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+export 'core/router.dart';

lib/modules/external_modules/core/router.dart

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+import 'package:fluro/fluro.dart';
+import 'package:flutter/material.dart';
+import 'package:lunasea/core.dart';
+import 'package:lunasea/modules/external_modules.dart';
+
+class ExternalModulesRouter extends LunaModuleRouter {
+  @override
+  void defineAllRoutes(FluroRouter router) {
+    ExternalModulesHomeRouter().defineRoute(router);
+  }
+}
+
+abstract class ExternalModulesPageRouter extends LunaPageRouter {
+  ExternalModulesPageRouter(String route) : super(route);
+
+  @override
+  void noParameterRouteDefinition(
+    FluroRouter router, {
+    bool homeRoute = false,
+  }) {
+    router.define(
+      fullRoute,
+      handler: Handler(
+        handlerFunc: (context, params) => widget(),
+      ),
+      transitionType: LunaRouter.transitionType,
+    );
+  }
+
+  @override
+  void withParameterRouteDefinition(
+    FluroRouter router,
+    Widget Function(BuildContext, Map<String, List<String>>) handlerFunc, {
+    bool homeRoute = false,
+  }) {
+    router.define(
+      fullRoute,
+      handler: Handler(
+        handlerFunc: (context, params) => handlerFunc(context, params),
+      ),
+      transitionType: LunaRouter.transitionType,
+    );
+  }
+}

lib/modules/external_modules/routes.dart

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+export 'routes/external_modules.dart';

lib/modules/external_modules/routes/external_modules.dart

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+export 'external_modules/route.dart';
+export 'external_modules/widgets.dart';

lib/modules/external_modules/routes/external_modules/route.dart

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+import 'package:flutter/material.dart';
+import 'package:lunasea/core.dart';
+import 'package:lunasea/modules/external_modules.dart';
+
+class ExternalModulesHomeRouter extends ExternalModulesPageRouter {
+  ExternalModulesHomeRouter() : super('/externalmodules');
+
+  @override
+  Widget widget() => _Widget();
+
+  @override
+  void defineRoute(FluroRouter router) {
+    super.noParameterRouteDefinition(router);
+  }
+}
+
+class _Widget extends StatefulWidget {
+  @override
+  State<_Widget> createState() => _State();
+}
+
+class _State extends State<_Widget> with LunaScrollControllerMixin {
+  final GlobalKey<ScaffoldState> _scaffoldKey = GlobalKey<ScaffoldState>();
+
+  @override
+  Widget build(BuildContext context) {
+    return LunaScaffold(
+      scaffoldKey: _scaffoldKey,
+      appBar: _appBar(),
+      drawer: _drawer(),
+      body: _body(),
+    );
+  }
+
+  Widget _appBar() {
+    return LunaAppBar(
+      useDrawer: true,
+      title: LunaModule.EXTERNAL_MODULES.name,
+      scrollControllers: [scrollController],
+    );
+  }
+
+  Widget _drawer() => LunaDrawer(page: LunaModule.EXTERNAL_MODULES.key);
+
+  Widget _body() {
+    if ((Database.externalModulesBox.length ?? 0) == 0) {
+      return LunaMessage.moduleNotEnabled(
+        context: context,
+        module: LunaModule.EXTERNAL_MODULES.name,
+      );
+    }
+    return LunaListView(
+      controller: scrollController,
+      children: _list,
+    );
+  }
+
+  List get _list {
+    List<ExternalModulesModuleTile> list = List.generate(
+      Database.externalModulesBox.length,
+      (index) => ExternalModulesModuleTile(
+        module: Database.externalModulesBox.getAt(index),
+      ),
+    );
+    list.sort(
+      (a, b) => a.module.displayName
+          .toLowerCase()
+          .compareTo(b.module.displayName.toLowerCase()),
+    );
+    return list;
+  }
+}

lib/modules/external_modules/routes/external_modules/widgets.dart

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+export 'widgets/module_tile.dart';

lib/modules/external_modules/routes/external_modules/widgets/module_tile.dart

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+import 'package:flutter/material.dart';
+import 'package:lunasea/core.dart';
+
+class ExternalModulesModuleTile extends StatelessWidget {
+  final ExternalModuleHiveObject module;
+
+  ExternalModulesModuleTile({
+    Key key,
+    @required this.module,
+  }) : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    return LunaListTile(
+      context: context,
+      title: LunaText.title(text: module.displayName),
+      subtitle: LunaText.subtitle(text: module.host),
+      trailing: LunaIconButton(icon: Icons.arrow_forward_ios_rounded),
+      onTap: () async => module.host.lunaOpenGenericLink(),
+    );
+  }
+}