Update Offline User Manual to match Notepad++ v8.7.1 release.
Includes new features from v8.6.7, v8.6.8, v8.6.9, and v8.7 as well.
Also includes improvements to documentation, including "Keeping UDL Files Separate", User Interface, Sessions, Themes, and Editing modes.
Full Changelog: v4.4...v4.5