GitLab

* Made PackageManager.TempDir private

* Merged InstallToolRelease function into the proper packagemanager method

* Moved uninstallToolRelease into the proper packagamanger method

* Moved uninstallPlatformRelease into the proper packagamanger method

* Moved downloadToolRelease into the proper packagamanger method

* Merged downloadTool with the proper packagamanger method

* Merged downloadPlatform with the proper packagamanger method

* Moved installPlatform into a packagamanger method

* Moved upgradePlatform into a packagamanger method

* Made PackageManager.Log field private

* Removed the massive code duplication in the 'upgrade' command

* Removed the massive code duplication in the 'outdated' command

* Updated docs

* Update arduino/cores/packagemanager/install_uninstall.go
Co-authored-by: per1234 <accounts@perglass.com>

* Update arduino/cores/packagemanager/install_uninstall.go
Co-authored-by: per1234 <accounts@perglass.com>
Co-authored-by: per1234 <accounts@perglass.com>