[fv_all] Migrate from keyboards.csv to regions.json and add to fv_all.kmp

[darcywong00]

Relates to Keyman 18.0 work for keymanapp/keyman#2036 and follows #2755

• Replace keyboards.csv with regions.json
• Add 7z.inc.sh to handle 7z calls
• Update fv_all build.sh script:
  • Merge regions.json with keyboards[] from kmp.json --> keyboards.json
  • Add keyboards.json to fv_all.kmp
  • Fail build if a new keyboard doesn't have a region declared in regions.json

My lack of JQ-fu makes some of this a dog's breakfast (notably updating fields, and converting to JSONArray).
I also couldn't figure out how to get the in-place jqi to work

keyboards/tools/jq.inc.sh

Lines 29 to 32 in e38fac8

	# JQ with inplace file replacement
	function jqi() {
	cat <<< "$($JQ -c "$1" < "$2")" > "$2"
	}

[darcywong00]

From

keyboards/ci.sh

Lines 33 to 37 in e38fac8

	if [ ! -z "${SEVENZ_HOME+x}" ]; then
	APP7Z="$SEVENZ_HOME/7z"
	else
	APP7Z="/c/Program Files/7-Zip/7z.exe"
	fi