Update 61.20 - Every|for|in X turns

• Added ability trigger: For X turns, temporary for X turns.
• Added ability trigger: Every X turns. (Short for Every X turn, at the start of your turn)
• Added ability trigger: In X turns. (Short for In X turn, at the start of your turn)
• Added ability trigger: Every X turns, at the end|start of every|enemy|your turn.
• Added ability trigger: In X turns, at the end|start of every|enemy|your turn.
• Added ability effect: Stop <target> from attacking.
• Manual editor: Added info about adding entries to default sections.
• Fix 'Give <target> Xmore attacks' not working.
• Fix delete in challenges editor.

Note: When setting custom text for in|every abilities, the turn number should be first.