docs: add SPDX MIT LICENSE to file headers

Author: brenocq

example/main.cpp

@@ -1,9 +1,8 @@
-//--------------------------------------------------
+// SPDX-License-Identifier: MIT
+// SPDX-FileCopyrightText: 2024-2025 Breno Cunha Queiroz
+
 // ImPlot3D Example
-// main.cpp
-// Date: 2024-11-17
-// Author: Breno Cunha Queiroz (brenocq.com)
-//--------------------------------------------------
+
 #include "imgui.h"
 #include "imgui_impl_glfw.h"
 #include "imgui_impl_opengl3.h"

implot3d.cpp

@@ -1,15 +1,13 @@
-//--------------------------------------------------
+// SPDX-License-Identifier: MIT
+// SPDX-FileCopyrightText: 2024-2025 Breno Cunha Queiroz
+
 // ImPlot3D v0.3 WIP
-// implot3d.cpp
-// Date: 2024-11-16
-// Author: Breno Cunha Queiroz (brenocq.com)
-//
+
 // Acknowledgments:
 //  ImPlot3D is heavily inspired by ImPlot
 //  (https://github.com/epezent/implot) by Evan Pezent,
 //  and follows a similar code style and structure to
 //  maintain consistency with ImPlot's API.
-//--------------------------------------------------
 
 // Table of Contents:
 // [SECTION] Includes

implot3d.h

@@ -1,15 +1,13 @@
-//--------------------------------------------------
+// SPDX-License-Identifier: MIT
+// SPDX-FileCopyrightText: 2024-2025 Breno Cunha Queiroz
+
 // ImPlot3D v0.3 WIP
-// implot3d.h
-// Date: 2024-11-16
-// Author: Breno Cunha Queiroz (brenocq.com)
-//
+
 // Acknowledgments:
 //  ImPlot3D is heavily inspired by ImPlot
 //  (https://github.com/epezent/implot) by Evan Pezent,
 //  and follows a similar code style and structure to
 //  maintain consistency with ImPlot's API.
-//--------------------------------------------------
 
 // Table of Contents:
 // [SECTION] Macros and Defines

implot3d_demo.cpp

@@ -1,15 +1,13 @@
-//--------------------------------------------------
+// SPDX-License-Identifier: MIT
+// SPDX-FileCopyrightText: 2024-2025 Breno Cunha Queiroz
+
 // ImPlot3D v0.3 WIP
-// implot3d_demo.cpp
-// Date: 2024-11-17
-// Author: Breno Cunha Queiroz (brenocq.com)
-//
+
 // Acknowledgments:
 //  ImPlot3D is heavily inspired by ImPlot
 //  (https://github.com/epezent/implot) by Evan Pezent,
 //  and follows a similar code style and structure to
 //  maintain consistency with ImPlot's API.
-//--------------------------------------------------
 
 // Table of Contents:
 // [SECTION] User Namespace

implot3d_internal.h

@@ -1,15 +1,13 @@
-//--------------------------------------------------
+// SPDX-License-Identifier: MIT
+// SPDX-FileCopyrightText: 2024-2025 Breno Cunha Queiroz
+
 // ImPlot3D v0.3 WIP
-// implot3d_internal.h
-// Date: 2024-11-17
-// Author: Breno Cunha Queiroz (brenocq.com)
-//
+
 // Acknowledgments:
 //  ImPlot3D is heavily inspired by ImPlot
 //  (https://github.com/epezent/implot) by Evan Pezent,
 //  and follows a similar code style and structure to
 //  maintain consistency with ImPlot's API.
-//--------------------------------------------------
 
 // Table of Contents:
 // [SECTION] Constants

implot3d_items.cpp

@@ -1,15 +1,13 @@
-//--------------------------------------------------
+// SPDX-License-Identifier: MIT
+// SPDX-FileCopyrightText: 2024-2025 Breno Cunha Queiroz
+
 // ImPlot3D v0.3 WIP
-// implot3d_items.cpp
-// Date: 2024-11-26
-// Author: Breno Cunha Queiroz (brenocq.com)
-//
+
 // Acknowledgments:
 //  ImPlot3D is heavily inspired by ImPlot
 //  (https://github.com/epezent/implot) by Evan Pezent,
 //  and follows a similar code style and structure to
 //  maintain consistency with ImPlot's API.
-//--------------------------------------------------
 
 // Table of Contents:
 // [SECTION] Includes

implot3d_meshes.cpp

@@ -1,15 +1,13 @@
-//--------------------------------------------------
+// SPDX-License-Identifier: MIT
+// SPDX-FileCopyrightText: 2024-2025 Breno Cunha Queiroz
+
 // ImPlot3D v0.3 WIP
-// implot3d_meshes.cpp
-// Date: 2024-12-07
-// Author: Breno Cunha Queiroz (brenocq.com)
-//
+
 // Acknowledgments:
 //  ImPlot3D is heavily inspired by ImPlot
 //  (https://github.com/epezent/implot) by Evan Pezent,
 //  and follows a similar code style and structure to
 //  maintain consistency with ImPlot's API.
-//--------------------------------------------------
 
 // Table of Contents:
 // [SECTION] Includes