fix: make ammo pickups actually to work

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)

inc/manager.h

@@ -144,7 +144,7 @@ public:
    void resetFilters ();
    void updateActiveGrenade ();
    void updateInterestingEntities ();
-   void captureChatRadio (const char *cmd, const char *arg, edict_t *ent);
+   void captureChatRadio (StringRef cmd, StringRef arg, edict_t *ent);
    void notifyBombDefuse ();
    void execGameEntity (edict_t *ent);
    void forEach (ForEachBot handler);