moves abstract_type up to datum, spawners wont spawn them (#92909)

## About The Pull Request
moves all implementations (im aware of) for "Im a parent type dont spawn
me please" to the datum layer to standardized behavior
adds a standerized proc for filtering out "bad" items that we dont want
spawning. applies to it the subtype vendor, gifts, and a new spawner and
mystery box for a random gun (neither playerfacing)
"port" of https://github.com/shiptest-ss13/Shiptest/pull/4621



https://github.com/user-attachments/assets/22f6f0b2-b44e-411a-b3dc-6b97dc0287aa

small warning: I dont have EVERY abstract type defined right now but,
ive done a good enough job for now. Im tired of data entry rn
## Why It's Good For The Game
standardizing behavior. Might be a micro hit to performance however

having this lets us not rely on icon state to determine whether
something is a parent type and makes it much easier to tell something is
a parent type (could be applied further to things like admin spawning
menus and things like that).

need feedback on if this is actually good for the game.
## Changelog
🆑
add: Soda cans show up in the silver slime drink table.
add: Examine tag for items that are not mean to show up ingame.
refactor: Standardizes how gifts rule out abstract types.
fix: gifts no longer check if something has an inhand, massively
expanding the list of potential items.
/🆑

code/modules/explorer_drone/exploration_events/_exploration_event.dm

@@ -1,7 +1,7 @@
 /// Exploration event
 /datum/exploration_event
 	/// These types will be ignored in event creation
-	var/root_abstract_type = /datum/exploration_event
+	abstract_type = /datum/exploration_event
 	///This name will show up in exploration list if it's repeatable
 	var/name = "Something interesting"
 	/// encountered at least once
@@ -40,7 +40,7 @@
 
 /// Simple events, not a full fledged adventure, consist only of single encounter screen
 /datum/exploration_event/simple
-	root_abstract_type = /datum/exploration_event/simple
+	abstract_type = /datum/exploration_event/simple
 	var/ui_image = "default"
 	/// Show ignore button.
 	var/skippable = TRUE

code/modules/explorer_drone/exploration_events/adventure.dm

@@ -2,7 +2,7 @@
 /datum/exploration_event/adventure
 	discovery_log = "Encountered something unexpected"
 	var/datum/adventure/adventure
-	root_abstract_type = /datum/exploration_event/adventure
+	abstract_type = /datum/exploration_event/adventure
 
 /datum/exploration_event/adventure/encounter(obj/item/exodrone/drone)
 	. = ..()

code/modules/explorer_drone/exploration_events/danger.dm

@@ -1,6 +1,6 @@
 /// Danger event - unskippable, if you have appriopriate tool you can mitigate damage.
 /datum/exploration_event/simple/danger
-	root_abstract_type = /datum/exploration_event/simple/danger
+	abstract_type = /datum/exploration_event/simple/danger
 	description = "You encounter a giant error."
 	var/required_tool = EXODRONE_TOOL_LASER
 	var/has_tool_action_text = "Fight"
@@ -88,7 +88,7 @@
 	required_tool = EXODRONE_TOOL_MULTITOOL
 	deep_scan_description = "Site is exposed to space radiation. Using self-diagnostic multiool attachment advised."
 	description = "The drone feed suddenly goes haywire! It seems that the drone got hit by a burst of cosmic rays! You'll have to wait for the signal to be restored."
-	has_tool_description = "Your multitool should allow a significant amount of the damage to be repaired on its own." //wait, what? 
+	has_tool_description = "Your multitool should allow a significant amount of the damage to be repaired on its own." //wait, what?
 	no_tool_description = "Nothing more to be done than to wait and assess the damage."
 	has_tool_action_text = "Wait"
 	no_tool_action_text = "Wait"

code/modules/explorer_drone/exploration_events/resource.dm

@@ -1,7 +1,7 @@
 /// Simple event type that checks if you have a tool and after a retrieval delay adds loot to drone.
 /datum/exploration_event/simple/resource
 	name = "retrievable resource"
-	root_abstract_type = /datum/exploration_event/simple/resource
+	abstract_type = /datum/exploration_event/simple/resource
 	discovery_log = "Encountered recoverable resource."
 	action_text = "Extract"
 	/// Tool type required to recover this resource

code/modules/explorer_drone/exploration_events/trader.dm

@@ -1,6 +1,6 @@
 /// Trader events - If drone is loaded with X exchanges it for Y, might require translator tool.
 /datum/exploration_event/simple/trader
-	root_abstract_type = /datum/exploration_event/simple/trader
+	abstract_type = /datum/exploration_event/simple/trader
 	action_text = "Trade"
 	/// Obj path we'll take or list of paths ,one path will be picked from it at init
 	var/required_path

code/modules/explorer_drone/exploration_site.dm

@@ -120,7 +120,7 @@ GLOBAL_LIST_EMPTY(exploration_sites)
 	. = list()
 	for(var/event_type in subtypesof(/datum/exploration_event))
 		var/datum/exploration_event/event = event_type
-		if(initial(event.root_abstract_type) == event_type)
+		if(initial(event.abstract_type) == event_type)
 			continue
 		event = new event_type
 		.[event_type] = list("required" = event.required_site_traits,"blacklisted" = event.blacklisted_site_traits)