Set IMGUI_VERSION_TAG to v1.92.7-docking for C.I.

Set IMGUI_VERSION_TAG to v1.92.6-docking for C.I.

Fix compilation with the latest version of nCine

Split the user interface in multiple window classes

Add a new sprite animation class

Add the explicit keyword to several constructors

Write a JSON manifest file for pushed artifacts

Compile the nCine without the scenegraph

Use an env variable for ImGui version in workflows

Update interface code for ImGui 1.92.1

Update the GitHub Actions workflow files

Fix compilation with the latest version of nCine

Use new ImGui TextLinkOpenURL() in the about window

Update older macOS GitHub Actions runner to 13

Fix compilation with newer versions of ImGui