update: Blender 4.*

[AlexsandroAF]

Summary of Changes

This pull request introduces several improvements to the Auto Align plugin for Blender, focusing on code readability, compatibility, and minor fixes. The key updates include:

**Blender Version Compatibility:**
    Updated the blender version in bl_info from (3, 1, 2) to (4, 0, 0), ensuring compatibility with the latest Blender version.

**Code Readability:**
    Simplified the normalization of vectors using keepdims=True in NumPy operations for improved clarity and conciseness.
    Cleaned up property definitions by importing BoolProperty and PointerProperty directly instead of relying on bpy.props.

**Version Increment:**
    Incremented the plugin version from 0.5.0 to 0.5.1, reflecting minor improvements and compatibility updates.

**General Cleanup:**
    Refined code structure to align with best practices and ensure consistent behavior.

Impact

These changes ensure compatibility with Blender 4.0, enhance code readability, and improve maintainability without altering the plugin's core functionality. The plugin retains its functionality and performance while being more maintainable and future-proof.