- all interactive commands now **don't build the artifact** anymore; just patches/.configs are produced and then build ends
- user is required to put the produced patches in the right place and build again, for full consistency
- split ATF and U-BOOT manual patching process; use CLI command `atf-patch` to patch ATF, and `uboot-patch` to patch u-boot
- non-interactive artifact builds are now 100% sans-stdin
- introduce `uboot-config` CLI command; still experimental, only produces a defconfig and not a patch
- reworked `userpatch_create()` to be (hopefully) more useful:
- detects a previous patch and offers to apply it before continuing
- enters a loop showing the diff, and only proceeds when user indicates he's happy with the patch
- produces `mbox`-formatted patches via `format-patch` and standard Armbian parameters
- uses MAINTAINER and MAINTAINERMAIL instead of git configuration (so it works in containers)
- don't allow image builds with any patching or configuring _at all_ (it has been deprecated with a warning for months already, and results are inconsistent)
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