Adds an universal object health system. (#21266)

https://www.youtube.com/watch?v=ZpUYjpKg9KY

As per title. The goal is to add health to most objects in the game and
thus allow them to be dynamically destructible, while also avoiding
shitcode like each structure having its own snowflake health update
proc.

---------

Signed-off-by: Matt Atlas <mattiathebest2000@hotmail.it>
Co-authored-by: Matt Atlas <liermattia@gmail.com>
Co-authored-by: SleepyGemmy <99297919+SleepyGemmy@users.noreply.github.com>

code/modules/mining/minebot.dm

@@ -6,7 +6,7 @@
 	law_type = /datum/ai_laws/mining_drone
 	module_type = /obj/item/robot_module/mining_drone
 	holder_type = /obj/item/holder/drone/mining
-	maxHealth = 45
+	maxhealth = 45
 	health = 45
 	pass_flags = PASSTABLE|PASSRAILING
 	req_access = list(ACCESS_MINING, ACCESS_ROBOTICS)
@@ -105,7 +105,7 @@
 		if(seeking_player)
 			to_chat(user, SPAN_WARNING("\The [src] is already in the reboot process."))
 			return
-		if(!GLOB.config.allow_drone_spawn || emagged || health < -maxHealth) //It's dead, Dave.
+		if(!GLOB.config.allow_drone_spawn || emagged || health < -maxhealth) //It's dead, Dave.
 			to_chat(user, SPAN_WARNING("The interface is fried, and a distressing burned smell wafts from the robot's interior. You're not rebooting this one."))
 			return
 
@@ -168,7 +168,7 @@
 	if(M.health_upgrade)
 		to_chat(user, SPAN_WARNING("[src] already has a reinforced chassis!"))
 		return
-	M.maxHealth = 100
+	M.maxhealth = 100
 	M.health += 55
 	for(var/V in M.components)
 		if(V != "power cell")