Remove redundant features for event edit

[NitayRabi]

Overview of the problem

Editing event page contains redundant data (duplicate terms for presale/group sale, editing camps/arts checkbox etc)
We should rethink the data relevant for event rules (which determines different features inside spark application)

Expected behavior

All "event features" should be easy to understand and manipulate.

• Are camps and arts available (for searching/viewing/joining)
• Are camps and arts editable
• Is early arrival allocation available
• Is appreciation allocation available

Actual behavior

Names are not intuitive, certain terms describe same features.
The page isn't designed well (Hx hierarchy, containers etc...)