SC2: Content update (#5312)

Feature highlights:
- Adds many content to the SC2 game
- Allows custom mission order
- Adds race-swapped missions for build missions (except Epilogue and NCO)
- Allows War Council Nerfs (Protoss units can get pre - War Council State, alternative units get another custom nerf to match the power level of base units)
- Revamps Predator's upgrade tree (never was considered strategically important)
- Adds some units and upgrades
- Locked and excluded items can specify quantity
- Key mode (if opt-in, missions require keys to be unlocked on top of their regular regular requirements
- Victory caches - Victory locations can grant multiple items to the multiworld instead of one 
- The generator is more resilient for generator failures as it validates logic for item excludes
- Fixes the following issues:
  - https://github.com/ArchipelagoMW/Archipelago/issues/3531 
  - https://github.com/ArchipelagoMW/Archipelago/issues/3548

worlds/sc2/starcraft2.kv

@@ -0,0 +1,61 @@
+<CampaignScroll>
+    scroll_type: ["content", "bars"]
+    bar_width: dp(12)
+    effect_cls: "ScrollEffect"
+    canvas.after:
+        Color:
+            rgba: (0.82, 0.2, 0, root.border_on)
+        Line:
+            width: 1.5
+            rectangle: self.x+1, self.y+1, self.width-1, self.height-1
+
+<DownloadDataWarningMessage>
+    color: (1, 1, 1, 1)
+    canvas.before:
+        Color:
+            rgba: (0xd2/0xff, 0x33/0xff, 0, 1)
+        Rectangle: 
+            pos: (self.x - 8, self.y - 8)
+            size: (self.width + 30, self.height + 16)
+
+<MultiCampaignLayout>
+    cols: 1
+    size_hint_y: None
+    height: self.minimum_height + 15
+    padding: [5,0,dp(12),0]
+
+<CampaignLayout>:
+    cols: 1
+
+<MissionLayout>:
+    rows: 1
+
+<RegionLayout>:
+    cols: 1
+
+<ColumnLayout>:
+    rows: 1
+
+<MissionCategory>:
+    cols: 1
+    spacing: [0,5]
+
+<MissionButton>:
+    text_size: self.size
+    markup: True
+    halign: 'center'
+    valign: 'middle'
+    padding: [5,0,5,0]
+    outline_width: 1
+    canvas.before:
+        Color:
+            rgba: (1, 193/255, 86/255, root.is_goal)
+        Line:
+            width: 1
+            rectangle: (self.x, self.y + 0.5, self.width, self.height)
+    canvas.after:
+        Color:
+            rgba: (0.8, 0.8, 0.8, root.is_exit)
+        Line:
+            width: 1
+            rectangle: (self.x + 2, self.y + 3, self.width - 4, self.height - 4)