[Bots] Cleanup and remove preprocessors. (#2757)

* [Bots] Cleanup and remove preprocessors.

- Removes every `#ifdef BOTS` we have and locks bots behind `Bots:AllowBots` rule.
- Bot updates are now done by default similar to regular database updates.
- Modify `CMakeLists.txt`, `.drone.yml`, and `BUILD.md` to match the removal of `EQEMU_ENABLE_BOTS`.

* Cleanup

- Add SQL for enabling bots for servers with bots.
- Add message that tells players/operators bots are disabled.

* Suggested changes.

* Bot injection stuff

* Change SQL to bot SQL.

* Tweaks

* Remove `is_bot`

* Update version.h

* Update main.cpp

* Update database.cpp

* Fix name availability crash

* Remove bots from update script

Co-authored-by: Akkadius <akkadius1@gmail.com>

zone/aggro.cpp

@@ -27,9 +27,7 @@
 #include "entity.h"
 #include "mob.h"
 
-#ifdef BOTS
 #include "bot.h"
-#endif
 
 #include "map.h"
 #include "water_map.h"
@@ -818,14 +816,15 @@ type', in which case, the answer is yes.
 			}
 		}
 
-#ifdef BOTS
-		// this is HIGHLY inefficient
-		bool HasRuleDefined = false;
-		bool IsBotAttackAllowed = false;
-		IsBotAttackAllowed = Bot::IsBotAttackAllowed(mob1, mob2, HasRuleDefined);
-		if(HasRuleDefined)
-			return IsBotAttackAllowed;
-#endif //BOTS
+		if (RuleB(Bots, Enabled)) {
+			// this is HIGHLY inefficient
+			bool HasRuleDefined     = false;
+			bool IsBotAttackAllowed = false;
+			IsBotAttackAllowed = Bot::IsBotAttackAllowed(mob1, mob2, HasRuleDefined);
+			if (HasRuleDefined) {
+				return IsBotAttackAllowed;
+			}
+		}
 
 		// we fell through, now we swap the 2 mobs and run through again once more
 		tempmob = mob1;
@@ -905,10 +904,8 @@ bool Mob::IsBeneficialAllowed(Mob *target)
 			{
 				return false;
 			}
-#ifdef BOTS
 			else if(mob2->IsBot())
 				return true;
-#endif
 		}
 		else if(_NPC(mob1))
 		{