Changes since v1.4.1

A bunch of small but useful improvements this release:

HDRView now supports HDR/XDR displays on macOS!
On macOS, HDRView now supports loading images via Finder or dragging-and-dropping onto the application (you can now set HDRView as the associated image viewer for Finder/open!).
The info panel now dynamically adjusts precision of image statistics like the min, average, max
Removed submodules and switched to using CPM.cmake
Switched from docopt to CLI11. Windows builds no longer depend on Boost, which was the cause of most build/link issues.
Added missing icon files so make install works on Linux (thanks @fjavifabre)
Updated README.md

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