Use actual bots instead of fake client for interpolation, fix bots having no sound, increase bots limit, reworked name update logic

[zer0k-z]

Resolves #335.

A fake client is not a bot. The client doesn't store data for interpolation if the bot isn't initialized properly. Using bot_add should preserve the "no bot in server" behavior. Modifying bot_quota cvar is also an option, but that might mess with other plugins that happen to use bots as well.

Bot name updating now no longer requires the player to be put out of spectator mode, spec_target_updated event is fired instead.

[Szwagi]

Does bot_kick behave as intended when there are 2 bots with the same name?

[zer0k-z]

bot_add should ensure that they don't share the same name. More precisely, the server take a profile from a bot inside BotProfile.db, and as long as that file doesn't have duplicates, there won't be 2 bots with the same name.

[zer0k-z]

On why this fix works, it seems like previously the bot manager was responsible for generating user commands for bots, and the fake client isn't managed by the bot manager and doesn't generate a proper user command by themselves either, therefore breaking the interpolation process.