Bots move to vantage point to throw grenade

[sunzenshen]

Description

Previously for simplicity of the initial grenade throwing PR, bots would directly chase a threat's last known position in their attempt to peek out at the threat area. This PR introduces vantage point search logic to find a position that can see the threat's last known location, with more sophisticated search criteria. For example, bots can now side step to peek at the threat area rather than running directly at the threat area and being subsequently too close to throw their grenade anyway.

Toolchain

• Windows MSVC VS2022

[sunzenshen]

Sample test script to initiate TDM mode while enabling a debug overlay for grenade decisions:

sv_neo_gamemode_enforcement 3; 
sv_neo_gamemode_single 0; 
neo_vote_game_mode 0; 
mp_restartgame 1; 
sv_neo_bot_grenade_debug_behavior 1;

This PR adds another overlay color where green is the vantage point chosen by the bot to peek out at the known threat area.

Previous colors include:
red - the bot is thinking of tossing a grenade at a given target's last known position
grey - the bot is thinking of throwing a smoke grenade (difficult to catch since this logic is simpler and faster to deploy)
yellow - a guess of where a threat could emerge from
orange - the chosen intended grenade target area