add sdl3

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

build.zig

@@ -93,22 +93,63 @@ pub fn build(b: *std.Build) void {
     omt_mod.addLibraryPath(lib_output_path);
     omt_mod.addIncludePath(include_output_path);
 
-    // Main executable
-    const omtoy_exe = b.addExecutable(.{
-        .name = "omtoy",
-        .root_module = b.createModule(.{
-            .root_source_file = b.path("src/main.zig"),
-            .target = target,
-            .optimize = optimize,
-        }),
+    const sdl3 = b.dependency("sdl3", .{
+        .target = target,
+        .optimize = optimize,
+
+        // Lib options.
+        // .callbacks = false,
+        // .ext_image = false,
+        // .ext_net = false,
+        // .ext_ttf = false,
+        // .log_message_stack_size = 1024,
+        // .main = false,
+        // .renderer_debug_text_stack_size = 1024,
+
+        // Options passed directly to https://github.com/castholm/SDL (SDL3 C Bindings):
+        // .c_sdl_preferred_linkage = .static,
+        // .c_sdl_strip = false,
+        // .c_sdl_sanitize_c = .off,
+        // .c_sdl_lto = .none,
+        // .c_sdl_emscripten_pthreads = false,
+        // .c_sdl_install_build_config_h = false,
+
+        // Options if `ext_image` is enabled:
+        // .image_enable_bmp = true,
+        // .image_enable_gif = true,
+        // .image_enable_jpg = true,
+        // .image_enable_lbm = true,
+        // .image_enable_pcx = true,
+        // .image_enable_png = true,
+        // .image_enable_pnm = true,
+        // .image_enable_qoi = true,
+        // .image_enable_svg = true,
+        // .image_enable_tga = true,
+        // .image_enable_xcf = true,
+        // .image_enable_xpm = true,
+        // .image_enable_xv = true,
     });
 
-    b.installArtifact(omtoy_exe);
+    {
+        // Main executable
+        const omtoy_exe = b.addExecutable(.{
+            .name = "omtoy",
+            .root_module = b.createModule(.{
+                .root_source_file = b.path("src/main.zig"),
+                .target = target,
+                .optimize = optimize,
+            }),
+        });
 
-    const omtoy_run_step = b.step("run", "Run omtoy");
-    const omtoy_run = b.addRunArtifact(omtoy_exe);
-    omtoy_run_step.dependOn(&omtoy_run);
-    omtoy_run.step.dependOn(b.getInstallStep());
+        omtoy_exe.root_module.addImport("sdl3", sdl3.module("sdl3"));
+        b.installArtifact(omtoy_exe);
+
+        // Run step for main executable
+        const run_step = b.step("run", "Run omtoy");
+        const run_cmd = b.addRunArtifact(omtoy_exe);
+        run_step.dependOn(&run_cmd.step);
+        run_cmd.step.dependOn(b.getInstallStep());
+    }
 
     // Util executables
     {