Add (3.0) [textures] examples

[Andre-LA]

• [ ] textures_logo_raylib
• [ ] textures_mouse_painting
• [ ] textures_rectangle
• [ ] textures_srcrec_dstrec
• [ ] textures_image_drawing
• [ ] textures_image_generation
• [ ] textures_image_loading
• [ ] textures_image_processing
• [ ] textures_image_text
• [ ] textures_to_image
• [ ] textures_raw_data
• [ ] textures_particles_blending
• [ ] textures_npatch_drawing
• [ ] textures_background_scrolling
• [ ] textures_sprite_button
• [ ] textures_sprite_explosion
• [ ] textures_bunnymark