- seamlessly add Freetz-NG cross toolchain builder integration including first cross templates for Fritz!OS (see wiki)
- rename source folder crosstool-ng
- new commandline options -fng / --freetz-ng to open the Freetz-NG menu
- fix unset variables in syscheck-function to avoid multiple checks
- extend the installers to setup the correct packages for Freetz-NG (tested on Ubuntu 20.04, ArchLinux, CentOS 8, Fedora 31, openSUSE in WSL2)
s3.TUP: Add use of s3 internal package installer which was extented for plugin use in 2586ebf. Some code beautifying, add crosstool-ng version output in build.log.
_sys_check: Add support for distro Arch, CentOS 8, Fedora 31
installers: Update with s3.TUP pachage exceptions