Mark 3.1.0 (#1634)

# 3.1.0 / 2020-09-08

**General**

- Loosen team password confirmation in team settings to also accept the team captain's password to make it easier to change the team password
- Adds the ability to add custom user and team fields for registration/profile settings.
- Improve Notifications pubsub events system to use a subscriber per server instead of a subscriber per browser. This should improve the reliability of CTFd at higher load and make it easier to deploy the Notifications system

**Admin Panel**

- Add a comments functionality for admins to discuss challenges, users, teams, pages
- Adds a legal section in Configs where users can add a terms of service and privacy policy
- Add a Custom Fields section in Configs where admins can add/edit custom user/team fields
- Move user graphs into a modal for Admin Panel

**API**

- Add `/api/v1/comments` to manipulate and create comments

**Themes**

- Make scoreboard caching only cache the score table instead of the entire page. This is done by caching the specific template section. Refer to #1586, specifically the changes in `scoreboard.html`.
- Add rel=noopener to external links to prevent tab napping attacks
- Change the registration page to reference links to Terms of Service and Privacy Policy if specified in configuration

**Miscellaneous**

- Make team settings modal larger in the core theme
- Update tests in Github Actions to properly test under MySQL and Postgres
- Make gevent default in serve.py and add a `--disable-gevent` switch in serve.py
- Add `tenacity` library for retrying logic
- Add `pytest-sugar` for slightly prettier pytest output
- Add a `listen()` method to `CTFd.utils.events.EventManager` and `CTFd.utils.events.RedisEventManager`.
  - This method should implement subscription for a CTFd worker to whatever underlying notification system there is. This should be implemented with gevent or a background thread.
  - The `subscribe()` method (which used to implement the functionality of the new `listen()` function) now only handles passing notifications from CTFd to the browser. This should also be implemented with gevent or a background thread.

webpack.config.js

@@ -65,6 +65,7 @@ function getJSConfig(root, type, entries, mode) {
 
   return {
     entry: out,
+    mode: mode,
     output: {
       path: path.resolve(__dirname, 'CTFd', root, 'static', type),
       publicPath: '/' + root + '/static/' + type,
@@ -103,6 +104,13 @@ function getJSConfig(root, type, entries, mode) {
             priority: 1,
             reuseExistingChunk: true,
           },
+          components: {
+            name: 'components',
+            filename: `components.${ext}.js`,
+            test: /components/,
+            priority: 1,
+            reuseExistingChunk: true,
+          },
           default: {
             filename: `core.${ext}.js`,
             minChunks: 2,
@@ -147,7 +155,16 @@ function getJSConfig(root, type, entries, mode) {
             },
             cacheBusting: true,
           },
-        }
+        },
+        // This rule is magically used to load the <style> section of VueJS SFC.
+        // Don't really understand what magic Vue is using here but it works.
+        {
+          test: /\.css$/,
+          use: [
+            'vue-style-loader',
+            'css-loader'
+          ]
+        },
       ],
     },
     plugins: [
@@ -184,6 +201,7 @@ function getCSSConfig(root, type, entries, mode) {
 
   return {
     entry: out,
+    mode: mode,
     output: {
       path: path.resolve(__dirname, 'CTFd', root, 'static', type),
       publicPath: '/' + root + '/static/' + type,
@@ -208,13 +226,6 @@ function getCSSConfig(root, type, entries, mode) {
             }
           ]
         },
-        // {
-        //   test: /\.css$/,
-        //   use: [
-        //     'vue-style-loader',
-        //     'css-loader'
-        //   ]
-        // },
         {
           test: /\.(s?)css$/,
           use: [