Make the 1.5m snacks can configurable, to be useful for short junkets from a colonized world

Author: SteveBenz

src/ProgressiveColonizationSystem/GameData/ProgressiveColonizationSystem/Localization/en-us.cfg

@@ -65,7 +65,7 @@
         #LOC_PKS_PortableDigger_Parts_Description = Just the thing to dig up those hard-to-find Tier2+ resources.  Note that the stuff this drill gets just augments what is provided by the main scrounger at the base; it doesn't completely replace it.
         #LOC_PKS_ScannerHub_Parts_Description = An orbital control hub and data collection site for coordinating resource scanning on a body.  It needs to be located on a station orbiting the body you're scanning for.  It gets more effective at spotting stuff (that is, it's more likely to find something close to your base) if you have more satelites in orbit equipped with resource scanners.  The station needs to have qualified kerbals to run the system as well.  This part is also tiered - so you need a Tier-3 scanning hub in order to spot Tier-3 goodies on the ground.
         #LOC_PKS_Manufacturer = Nermable Nermables, Pty. Ltd.
-        #LOC_PKS_SmallSnacksCan_Parts_Description = Here's a nifty inline can to carry a load of snacks, perfect for that trip to Minmus or for bringing the whole gang to the Mun!
+        #LOC_PKS_SmallSnacksCan_Parts_Description = Here's a nifty inline can to carry a load of snacks, perfect for that trip to Minmus or for bringing the whole gang to the Mun!  It can be configured for Tier-4 snacks alone or, if it's used on a colony where you've already started agriculture, it can be configured for an ideal mix of snacks (just enough for 45 kerbal-days of tiered snacks and Tier-4 snacks).
         #LOC_PKS_BigSnacksCan_Parts_Description = A can for storing some snacks and fertilizer for those early long-duration flight tests.
         #LOC_PKS_Lunchbox_Parts_Description = Sometimes you just need a few snacks for those short junkets.
 

src/ProgressiveColonizationSystem/GameData/ProgressiveColonizationSystem/PKS-B9TankTypes.cfg

@@ -231,4 +231,79 @@ B9_TANK_TYPE:NEEDS[ExtraplanetaryLaunchpads]
         name = ComplexParts
         unitsPerVolume = 1
     }
+}
+
+// The unitsPerVolume for these is:
+//   b = base unitsPerVolume for snacks = .1
+//   e_tier = effectiveness of the snacks at a given tier; see TIERED_RESOURCE_DEFINITION[Snacks]
+//            (.6, .85, .95, .98, 1)
+// So to carry an even load, we want b*e_tier of the non-tier4 stuff and b*(1-e_tier) of the tier-4 stuff.
+B9_TANK_TYPE
+{
+    name = PksSnacksMix0
+    tankMass = 0.0000
+    tankCost = 0
+
+    // The default unitsPerVolume for snacks is .1
+    RESOURCE
+    {
+        name = Snacks-Tier0
+        unitsPerVolume = .06  // .6 * .1
+    }
+    RESOURCE
+    {
+        name = Snacks-Tier4
+        unitsPerVolume = .04  // (1-.6)*.1
+    }
+}
+B9_TANK_TYPE
+{
+    name = PksSnacksMix1
+    tankMass = 0.0000
+    tankCost = 0
+
+    RESOURCE
+    {
+        name = Snacks-Tier1
+        unitsPerVolume = .085
+    }
+    RESOURCE
+    {
+        name = Snacks-Tier4
+        unitsPerVolume = .015
+    }
+}
+B9_TANK_TYPE
+{
+    name = PksSnacksMix2
+    tankMass = 0.0000
+    tankCost = 0
+
+    RESOURCE
+    {
+        name = Snacks-Tier2
+        unitsPerVolume = .095
+    }
+    RESOURCE
+    {
+        name = Snacks-Tier4
+        unitsPerVolume = .005
+    }
+}
+B9_TANK_TYPE
+{
+    name = PksSnacksMix3
+    tankMass = 0.0000
+    tankCost = 0
+
+    RESOURCE
+    {
+        name = Snacks-Tier3
+        unitsPerVolume = .098
+    }
+    RESOURCE
+    {
+        name = Snacks-Tier4
+        unitsPerVolume = .002
+    }
 }

src/ProgressiveColonizationSystem/GameData/ProgressiveColonizationSystem/Parts/Small_Snacks_Can.cfg

@@ -32,10 +32,43 @@ PART
     bulkheadProfiles = size1, srf
     tags = cck-pks
 
-    RESOURCE
+    MODULE
     {
-        name = Snacks-Tier4
-        amount = 45
-        maxAmount = 45
+        name = ModuleB9PartSwitch
+        moduleID = cargoSwitch
+        switcherDescription = #LOC_SSPX_Switcher_Cargo_Name
+        baseVolume = 450
+        switchInFlight = True
+        affectDragCubes = false
+        SUBTYPE
+        {
+            name = Tier4 Snacks
+            tankType = PksSnacks4
+            title = Tier4 Snacks
+        }
+        SUBTYPE
+        {
+            name = Tier0 & Tier4 Snacks
+            tankType = PksSnacksMix0
+            title = Tier0/Tier4 Snacks
+        }
+        SUBTYPE
+        {
+            name = Tier1 & Tier4 Snacks
+            tankType = PksSnacksMix1
+            title = Tier1/Tier4 Snacks
+        }
+        SUBTYPE
+        {
+            name = Tier2 & Tier4 Snacks
+            tankType = PksSnacksMix2
+            title = Tier2/Tier4 Snacks
+        }
+        SUBTYPE
+        {
+            name = Tier3 & Tier4 Snacks
+            tankType = PksSnacksMix3
+            title = Tier3/Tier4 Snacks
+        }
     }
 }