Now supports

• cross compiling
• Clang/LLVM
• a rate run, which compiles many kernels in parallel (with just one job each) instead of compiling one really quick (with many jobs)

Update to beta2

Update to first pre-release of 0.5.0.

• new default for number of jobs used; see man page for details
• add "-m/--modconfig" that compiles a allmodconfig config (including modules)
• a new way to automatically determine how many jobs to use
• Linux 5.6 is default, needed for allmodconfig build with gcc10
• a lot of improvements to the documentation