Starting the server on Android is currently not possible because a) the server executable is currently not compiled for Android b) launching the server executable with `fork` and `exec` is not supported on Android and may result in strange bugs like broken networking.
Running the server in a background service or in a separate process by using `Runtime.getRuntime().exec` from Java code might be feasible, but this is currently too much effort and may be done in the future.
For now, the "Run server" button as well as the process related system functions are disabled via conditional compilation on Android, to prevent the networking bug that would otherwise be triggered by pressing the "Run server" button.
Restarting the client previously did not work, as the `shell_execute` function on Android uses `fork` which is not supported.
Now, the client is restarted by using an Android intent to restart the main activity. This is triggered by sending a user-defined message from the native code to the SDL main activity thread.
Support showing up to 128 players in the scoreboard and the spectator UI. The 128 players are rendered in 3 columns of 43 players in the scoreboard and in 4 columns of 32 players in the spectator UI. Other lists like the server info (ingame and in the server browser) and the voting list already support showing any number of players.
Changing the `sv_max_clients` config variable while the server is running does not change the maximum number of clients that can connect, as this is determined only once when the `CNetServer` is initialized. The reserved slot check and the calculation of the number of player slots for the `protocol7::CNetMsg_Sv_ServerSettings` message were using the `sv_max_clients` config variable directly, which was causing them to be out-of-sync with the real number of maximum clients.
Existing uses of the `sv_max_clients` config variable, except for the `CNetServer` initialization, are replaced with `MaxClients()`. The config variable `sv_max_clients` is now marked as read-only after reading the initial config and command line argument, so changing it via the remote console is not possible and shows an error message. The unnecessary conchain for `sv_max_clients` is removed.
Use the real number of maximum clients returned by the `MaxClients()` function instead of the `MAX_CLIENTS` constant to calculate the debug dummy client IDs to fix a crash when `sv_max_clients` is below `MAX_CLIENTS`.
Ensure the `dbg_dummies` value does not exceed the maximum number of clients.
The item data size is already returned by the `IClient::SnapGetItem` function and getting only the size is not currently useful, so the additional `IClient::SnapItemSize` function is unnecessary.
Let the `IClient::SnapGetItem` function return an `IClient::CSnapItem` directly instead of passing it as a pointer. Add the item data pointer as a member variable to `IClient::CSnapItem` instead of returning it separately. Therefore, the separate data pointer of the class `CSnapEntities` is also not necessary anymore.
Consistently mark the snapshot items and data as `const`. The C-style cast to `void *` in the `IClient::SnapGetItem` function was previously implicitly casting away the `const` of the snapshot pointers.
Using `CSnapshotStorage::CHolder`s in the `demo_extract_chat` tool is not necessary, as only the member variable `m_pAltSnap` is being used in this tool. The regular snapshot data was copied into `m_pSnap` but never read. The other member variables were initialized but never read.
Whereas `cargo` expects the `--manifest-path` argument after the `build` command, `cargo ndk` only supports arguments being specified before the `build` command, which was causing the Android build to fail with:
```
error: Failed loading manifest
error: No such file or directory (os error 2)
```
Regression from #8557.
