Temporarily allow checking isEmpty

These need to be converted into collections at some point.

Author: STREGA

Sources/GateEngine/Resources/Geometry/Raw/RawLines.swift

@@ -11,6 +11,10 @@ public struct RawLines: Sendable {
     var colors: [Float]
     var indices: [UInt16]
 
+    public var isEmpty: Bool {
+        return indices.isEmpty
+    }
+    
     public init() {
         positions = []
         colors = []

Sources/GateEngine/Resources/Geometry/Raw/RawPoints.swift

@@ -12,6 +12,10 @@ public struct RawPoints: Codable, Equatable, Hashable {
     var positions: [Float]
     var colors: [Float]
     var indices: [UInt16]
+    
+    public var isEmpty: Bool {
+        return indices.isEmpty
+    }
 
     public init() {
         self.positions = []