Force spawn at start of round

[AdamTadeusz]

Description

Use spawn instead of respawn to spawn players at start of a round, omitting the checks whether a player can spawn

Toolchain

• Windows MSVC VS2022
• Linux GCC Distro Native [Specify distro + GCC version]
• Linux GCC 10 Sniper 3.0

Linked Issues

• fixes Dying right before warmup/round ends and a new round begins results the player being dead for the next round #585

[Rainyan]

Seems to work. Tested with:

• Spawn a bot
• Wait for a new round to start
• Use host_timescale 5 to get well into the round, past whatever strange respawning mechanic(?) is going on initially
• Revert back to host_timescale 1
• Shoot the bot to win the round
• Wait for approximately mp_chattime-1 seconds
• Press kill bind to suicide at the last moment

With this change, you can still spawn into the next round, whereas before you'd sit out the next round.

We should also figure out how to prevent the player from materializing before they've chosen their loadout, but that's kind of orthogonal to this PR.