Add commands for adjusting bots' class

[Rainyan]

Description

Add the following (mainly) debug commands:

• Add bot_class cvar for adjusting which class bots should spawn as the next time. This var name and behaviour mimics the bot_class cvar of OGNT, with the exception of default value -1 (don't force class but instead use a random one), instead of 0 (always spawn recon bots).

• Add bot_changeclass command for switching all bots' classes right now instead of at next spawn (if allowed by gamerules/other cvars, it's left for the RequestSetClass logic to decide).

Reasoning for adding: bot_class is parity, and bot_changeclass is "SDK parity" prior to nextbots, although I can't remember if it was ever working for the NT classes. Also handy for people who want to test class-specific things with the bots but don't have the development tools set up to edit code.

Toolchain

• Windows MSVC VS2022

Linked Issues

[sunzenshen]

Some optional nits but LGTM:

[Rainyan]

@sunzenshen Revisiting your earlier review comments at #1478 (comment):

That said, I tried to change bot_class and bot_changeclass back to -1 and it doesn't restore the heterogeneous class compositions for the teams. Not sure if that's an edge case we want to solve for what are debugging commands.

I decided to rework this a little. Now, we should recover the random class distribution once the bot_class is returned to -1, and neither should the onetime command version bot_changeclass disrupt the class distribution for future rounds.

I also stumbled upon this comment:

neo/src/game/shared/neo/neo_enums.h

Line 23 in 0927549

NEO_CLASS__LOADOUTABLE_COUNT = NEO_CLASS_VIP + 1, // Cannot spawn as Juggernaut

so sadly, no more MechWarrior... the bounds are now checked using that value, so it caps to the VIP class as the maximum supported. But it would be neat to have a "everyone spawns as Juggernaut" as a supported feature. Maybe some day.

[Rainyan]

Also it should be noted that as explained in 08f175e, this does technically change the bots random class selection in that they will re-choose their classes after every respawn, instead of only choosing the class once when they were created. But I imagine this is not a problem, or could even be a good thing.

[sunzenshen]

LGTM

Also played around the the console commands and was able to change bots back to heterogeneous class compositions (-1). Also checked that I couldn't set the bots all to JGR (4). Probably for the best since that class is heavily dependent on the custom game mode.