Fix #2212: Prevent InvalidOperationException in PreGameLobby.Start

Add guard clause to block game start when no active players are found.
Logs diagnostic state, shows user-facing error with retry guidance,
and resets the start button so the user can try again.

Fix #2277: Prevent NullReferenceException when accessing table.contro…

…ller

- Add null checks to Card.controller and Group.controller properties
- Return None instead of Player when controller is not set
- Prevents SystemError when table has no controller assigned

Fix #2322: Remove null check on value type WordWrap struct

Fix #1799: Remove dead Android app menu handler code

Refactor: move reserved property names to static readonly HashSet

Fix #2030: group.viewers returns empty list for groups with default E…

…verybody visibility

Fix #1815: remove DC Percent stat from profile pages and player model

Fix export dialog: single selection mode, null-safe set lookup in o8c…

… export

Fix overly broad web function blocking per feedback

Co-authored-by: kellyelton <1356163+kellyelton@users.noreply.github.com>

remotecall dict support