feat(camera): add a way to lock the camera position

sonic-radiance.love/core/modules/world/camera/init.lua

@@ -42,6 +42,9 @@ function CameraSystem:new(world)
   self.verticalSplit  = SPLITSCREEN_ISVERTICAL
   self.targets = {}
 
+  self.xLocked = nil
+  self.yLocked = nil
+
   self:initViews()
 end
 
@@ -103,6 +106,23 @@ function CameraSystem:getViewPositions(id)
 
 end
 
+function CameraSystem:lockX(x)
+  self.xLocked = x
+end
+
+function CameraSystem:unlockX()
+  self.xLocked = nil
+end
+
+function CameraSystem:lockY(y)
+  self.yLocked = y
+end
+
+function CameraSystem:unlockY()
+  self.yLocked = nil
+end
+
+
 -- WRAPPER and UTILS
 -- Access data from the views
 
@@ -279,6 +299,14 @@ function CameraSystem:limitView(id)
 
   self.views.list[id].x = utils.math.between(posx, minx, maxx)
   self.views.list[id].y = utils.math.between(posy, miny, maxy)
+
+  if (self.xLocked ~= nil) then
+    self.views.list[id].x = self.xLocked
+  end
+
+  if (self.yLocked ~= nil) then
+    self.views.list[id].y = self.yLocked
+  end
 end
 
 -- UPDATE and MOVE functions