add sdl3

Needed to change to zig 0.15.2 as well, didn't work with 0.16

utils/sender.zig

@@ -55,7 +55,18 @@ pub fn main() !void {
         .FrameMetadataLength = 0,
     };
 
-    const content = try std.fs.cwd().readFileAlloc("california-1080-uyvy.yuv", allocator, .unlimited);
+    // 0.15
+    const content = try std.fs.cwd().readFileAlloc(
+        allocator,
+        "california-1080-uyvy.yuv",
+        std.math.maxInt(usize),
+    );
+    // 0.16
+    // const content = try std.fs.cwd().readFileAlloc(
+    //     "california-1080-uyvy.yuv",
+    //     allocator,
+    //     .unlimited,
+    // );
     defer allocator.free(content);
 
     const audio_samples = 800;