fix: buy: bots never buy enough ammo for secondary weapons
fix: yb_pickup_best disabling all pickups instead of weapons only
add: yb_pickup_ammo_and_kits, that allows to enable ammos medkits and kevlars
refactor: switched to crlib strings where possible
refactor: fix some compiler warnings at high levels
refactor: move constants to separate header (thx @spodlesniy)
nav: increase recent-probe repeat time
bot: allow to camp with secondary weapon if enough friends alive
bot: think runs now at minimum 50fps, instead of every frame on xash3d
bot: make multilingual system work on xash3d (except menus right now)
engine: mark xash3d engine as modern game version
engine: add xash3d-specific cvars that are not registered on goldsrc
cfg: do not spam on logs if multilingual or chatter configs not loaded because of game version
fix: crash when saving old format pwf on hlds
bot: moved sdk headers to separate submodule
nav: improved unstuck and avoidance (thanks @commandcobra7) code
bot: use correct path slashes depending on platform for all data
cfg: removed simplified chines' translation, as it's too outdated