ImGui-SFML 3.0

What's Changed

• Upgraded SFML requirement to 3.0.0!
  • See SFML 3.0.0 release announcement for full details
• Upgraded ImGui requirement to 1.91.1 in #310
• Raised C++ requirement to C++17
• Added definitions for ImageButton with explicit ID by @Sinan-Karakaya in #266
• Fix ImTextureID type by @pifopi in #298
• Remove use of obsolete ImGui functions - v1.89 by @Legulysse in #303
• Fix for imgui 1.91.5 (clean some deprecated API calls) by @Legulysse in #305

New Contributors

• @metaleap made their first contribution in #264
• @Sinan-Karakaya made their first contribution in #266
• @AlexAUT made their first contribution in #287
• @peytonk132 made their first contribution in #297
• @Legulysse made their first contribution in #303

Full Changelog: v2.6...v3.0