armbian-next: artifacts: introduce kernel/u-boot artifacts; git ref2info; "memoizer"; some hashing

- artifacts: u-boot/kernel - pt7 - adapt legacy/artifact versions; use common `capture_rename_legacy_debs_into_artifacts()`
- artifacts: u-boot - pt6: add artifact for u-boot
  - use artifact version / reason in actual u-boot .deb if present
- artifacts: kernel - pt5: tune kernel version, refactor
- artifacts: kernel - pt4: squash unrelated bugs that show up; move `prepare_compilation_vars()` to default build
- artifacts: kernel - pt3: drivers+patches+.config hashing
  - split file hashing function from drivers-harness; fix it so filenames are relative and sorted; sort from ${SRC}, always
  - aplit prepare_kernel_config_core_or_userpatches() from `kernel_config_initialize()`
- artifacts: kernel - pt2:  memoizing git ref2info
- artifacts: kernel - pt1:  versioning

lib/functions/logging/logging.sh

@@ -18,6 +18,7 @@ function logging_init() {
 	declare -g bright_red_color="\e[1;31m" red_color="\e[0;31m"
 	declare -g bright_blue_color="\e[1;34m" blue_color="\e[0;34m"
 	declare -g bright_magenta_color="\e[1;35m" magenta_color="\e[0;35m"
+	declare -g bright_yellow_color="\e[1;33m" yellow_color="\e[0;33m"
 	declare -g ansi_reset_color="\e[0m"
 	declare -g -i logging_section_counter=0 # -i: integer
 	declare -g tool_color="${gray_color}"   # default to gray... (should be ok on terminals)