Webpack (#1367)

* Replace gulp with webpack and npm scripts for JS compilation
* Set up Travis CI to commit compiled JS
* Restructure `js` directory; only one instance of npm, forum/admin are "submodules"
* Refactor JS initializers into Application subclasses
* Maintain partial compatibility API (importing from absolute paths) for extensions
* Remove minification responsibility from PHP asset compiler
* Restructure `less` directory

less/admin.less

@@ -0,0 +1,10 @@
+@import "common/common";
+
+@import "admin/AdminNav";
+@import "admin/DashboardPage";
+@import "admin/BasicsPage";
+@import "admin/PermissionsPage";
+@import "admin/EditGroupModal";
+@import "admin/ExtensionsPage";
+@import "admin/AppearancePage";
+@import "admin/MailPage";

less/admin/app.less

@@ -1,10 +0,0 @@
-@import "../lib/lib.less";
-
-@import "AdminNav.less";
-@import "DashboardPage.less";
-@import "BasicsPage.less";
-@import "PermissionsPage.less";
-@import "EditGroupModal.less";
-@import "ExtensionsPage.less";
-@import "AppearancePage.less";
-@import "MailPage.less";

less/common/common.less

@@ -0,0 +1,31 @@
+@import "fontawesome";
+@import "fa-brands";
+@import "fa-regular";
+@import "fa-solid";
+@fa-font-path: "./fonts";
+
+@import "normalize";
+@import "print";
+@import "scaffolding";
+@import "sideNav";
+@import "mixins";
+
+@import "App";
+@import "Alert";
+@import "AlertManager";
+@import "Avatar";
+@import "Badge";
+@import "Button";
+@import "Checkbox";
+@import "Dropdown";
+@import "Form";
+@import "FormControl";
+@import "LoadingIndicator";
+@import "Modal";
+@import "Navigation";
+@import "Placeholder";
+@import "Search";
+@import "Select";
+@import "Tooltip";
+
+@import "variables";

less/forum.less

@@ -0,0 +1,25 @@
+@import "common/common";
+
+@import "forum/ActivityPage";
+@import "forum/AvatarEditor";
+@import "forum/Composer";
+@import "forum/DiscussionHero";
+@import "forum/DiscussionList";
+@import "forum/DiscussionListItem";
+@import "forum/DiscussionPage";
+@import "forum/EditUserModal";
+@import "forum/Hero";
+@import "forum/IndexPage";
+@import "forum/LogInButton";
+@import "forum/LogInModal";
+@import "forum/NotificationGrid";
+@import "forum/NotificationList";
+@import "forum/NotificationsDropdown";
+@import "forum/Post";
+@import "forum/PostStream";
+@import "forum/Scrubber";
+@import "forum/SettingsPage";
+@import "forum/SignUpModal";
+@import "forum/Slidable";
+@import "forum/UserCard";
+@import "forum/UserPage";

less/forum/app.less

@@ -1,25 +0,0 @@
-@import "../lib/lib.less";
-
-@import "ActivityPage.less";
-@import "AvatarEditor.less";
-@import "Composer.less";
-@import "DiscussionHero.less";
-@import "DiscussionList.less";
-@import "DiscussionListItem.less";
-@import "DiscussionPage.less";
-@import "EditUserModal.less";
-@import "Hero.less";
-@import "IndexPage.less";
-@import "LogInButton.less";
-@import "LogInModal.less";
-@import "NotificationGrid.less";
-@import "NotificationList.less";
-@import "NotificationsDropdown.less";
-@import "Post.less";
-@import "PostStream.less";
-@import "Scrubber.less";
-@import "SettingsPage.less";
-@import "SignUpModal.less";
-@import "Slidable.less";
-@import "UserCard.less";
-@import "UserPage.less";

less/lib/lib.less

@@ -1,31 +0,0 @@
-@import "fontawesome.less";
-@import "fa-brands.less";
-@import "fa-regular.less";
-@import "fa-solid.less";
-@fa-font-path: "./fonts";
-
-@import "normalize.less";
-@import "print.less";
-@import "scaffolding.less";
-@import "sideNav.less";
-@import "mixins.less";
-
-@import "App.less";
-@import "Alert.less";
-@import "AlertManager.less";
-@import "Avatar.less";
-@import "Badge.less";
-@import "Button.less";
-@import "Checkbox.less";
-@import "Dropdown.less";
-@import "Form.less";
-@import "FormControl.less";
-@import "LoadingIndicator.less";
-@import "Modal.less";
-@import "Navigation.less";
-@import "Placeholder.less";
-@import "Search.less";
-@import "Select.less";
-@import "Tooltip.less";
-
-@import "variables.less";