Added skip for pointer to functions, added int64_t compat type

BlendFile/CompatTypes/int64_t.cs

@@ -0,0 +1,9 @@
+namespace BlendFile.CompatTypes;
+
+public readonly struct int64_t {
+    public Int64 Value { get; }
+    
+    public int64_t(long value) {
+        Value = value;
+    }
+}

BlendFile/CompatTypes/int8_t.cs

@@ -5,7 +5,7 @@ public readonly struct int8_t {
     private readonly sbyte _value;
 
     public int8_t(sbyte value) => _value = value;
-    public int8_t(int8_t value) => _value = (sbyte)value._value;
+    public int8_t(int8_t value) => _value = value._value;
     
     public static explicit operator sbyte(int8_t value) => value._value;
     public static implicit operator int8_t(sbyte value) => new(value);

BlendFile/CompatTypes/uchar.cs

@@ -1,5 +1,3 @@
-using System.Numerics;
-
 namespace BlendFile.CompatTypes;
 
 public readonly struct uchar {