Fix spray nozzle not cleaning reagents properly (#35950)

* init, god help us all

* further refining

* final round of bugfixes

* whoopsies

* To file scoped namespace

* first review

* oopsie

* oopsie woopsie

* pie is on my face

* persistence

* datafieldn't

* make PreviousTileRef nullable

* change component to file scoped namespace

* Minor tweaks:

- We clamp the reaction amount to a minimum value because when working with percentages and dividing, we approach numbers like 0.01 and never actually properly delete the entity (because we check for zero). This allows us to react with a minimum amount and cleans things up nicely.
- Minor clarification to comments.
- Rebalancing of the spray nozzle projectile.

* the scug lies!!!!

* undo file scoped namespace in system

* kid named warning

---------

Co-authored-by: ScarKy0 <106310278+ScarKy0@users.noreply.github.com>

Resources/Prototypes/Entities/Objects/Specific/Janitorial/spray.yml

@@ -99,8 +99,8 @@
   - type: Tag
     tags:
       - Spray
-# Vapor
 
+# Vapor
 - type: entity
   id: Vapor
   name: "vapor"
@@ -111,6 +111,8 @@
       vapor:
         maxVol: 50
   - type: Vapor
+    active: true
+    transferAmountPercentage: 0.5
   - type: AnimationPlayer
   - type: Sprite
     sprite: Effects/chempuff.rsi

Resources/Prototypes/Entities/Objects/Weapons/Guns/Projectiles/projectiles.yml

@@ -936,6 +936,7 @@
         - BulletImpassable
   - type: Vapor
     active: true
+    transferAmountPercentage: 1
   - type: Appearance
   - type: VaporVisuals