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.

migrations/versions/75e8ab9a0014_add_fields_and_fieldentries_tables.py

@@ -0,0 +1,53 @@
+"""Add Fields and FieldEntries tables
+
+Revision ID: 75e8ab9a0014
+Revises: 0366ba6575ca
+Create Date: 2020-08-19 00:36:17.579497
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = "75e8ab9a0014"
+down_revision = "0366ba6575ca"
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.create_table(
+        "fields",
+        sa.Column("id", sa.Integer(), nullable=False),
+        sa.Column("name", sa.Text(), nullable=True),
+        sa.Column("type", sa.String(length=80), nullable=True),
+        sa.Column("field_type", sa.String(length=80), nullable=True),
+        sa.Column("description", sa.Text(), nullable=True),
+        sa.Column("required", sa.Boolean(), nullable=True),
+        sa.Column("public", sa.Boolean(), nullable=True),
+        sa.Column("editable", sa.Boolean(), nullable=True),
+        sa.PrimaryKeyConstraint("id"),
+    )
+    op.create_table(
+        "field_entries",
+        sa.Column("id", sa.Integer(), nullable=False),
+        sa.Column("type", sa.String(length=80), nullable=True),
+        sa.Column("value", sa.JSON(), nullable=True),
+        sa.Column("field_id", sa.Integer(), nullable=True),
+        sa.Column("user_id", sa.Integer(), nullable=True),
+        sa.Column("team_id", sa.Integer(), nullable=True),
+        sa.ForeignKeyConstraint(["field_id"], ["fields.id"], ondelete="CASCADE"),
+        sa.ForeignKeyConstraint(["team_id"], ["teams.id"], ondelete="CASCADE"),
+        sa.ForeignKeyConstraint(["user_id"], ["users.id"], ondelete="CASCADE"),
+        sa.PrimaryKeyConstraint("id"),
+    )
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_table("field_entries")
+    op.drop_table("fields")
+    # ### end Alembic commands ###