this release is maintenance / reorganization, no big features really! worked OK on Unity 2021.2.0f1 on built-in 3D pipeline, but I didn't test vigorously

to install in Unity: in Package Manager, add https://github.com/radiatoryang/hedera.git as a Git URL package ... (full instructions)

• full changelog
• in IvyEditor, added no-alt keyboard modifier, so orbiting 3D camera in scene view doesn't cause painting (https://github.com/radiatoryang/hedera/issues/12)
• moved example ivy profiles and textures to "Samples" folder, so that Package Manager users can import the data directly into their Assets (and thus modify them)
• added better adhesion -- fires raycasts to calculate nearest surface, good for mesh colliders? enable / disable with the new checkbox right below the "Start Painting" button... thanks for the PR, @alexjhetherington ! (see https://github.com/radiatoryang/hedera/pull/14 + https://github.com/radiatoryang/hedera/issues/13)