[Idea] Double Elimination Tournaments

[FLuplow]

1. Describe your idea

Double Elimination is a very popular tournament mode so it shouldn't need much introduction.
Players have two chances/lives before being "eliminated". Tournaments are divided into "Upper" and "Lower" Brackets.

Implementation needs work in the following areas:

• Brackets
• Tournament Progression
• Host Hub
• Tournament Creation

Also should check occurrences of tournament.mode.

Link to existing issue: #2

2. Why / How does this idea improve Etournity?

Double Elimination is the gold standard for most tournaments. It allows for a more engaging tournament progression.

Players have the chance to come back after an "unlucky" loss.

Organizers can create more exciting narratives through underdog stories, comebacks as well as rivalries from previous matches.

3. User Group

• Tournament Organizer
• Player
• Tournament Moderator
• Spectator
• Other