LTS v1.0.0

First official LTS release.

Mostly for Unity Package Manager support - install by either:

• UPM/Add from git (latest): "https://github.com/Seneral/UndoPro.git#release-pkg"
• UPM/Add from git (specific): "https://github.com/Seneral/UndoPro.git#v1.0.0-lts"
• UPM/Add from disk; package.json from unpacked SourceCode
• Importing the UnityPackage

Git release-pkg option is the only one with automatic updates

Difference from normal source on master branch:

• package.json for usage as a package
• Assembly Definition for separation from other code
• No Debugging windows (Editor subfolder)