bin, make, scripts: Re-add files necessary for packaging jw-build

Re-add all files necessary to package jw-build itself, i.e.
sucessfully run make pkg-rebuild-reinstall. This adds 1892 lines of
code.

Signed-off-by: Jan Lindemann <jan@janware.com>

scripts/ini-tools.sh

@@ -0,0 +1,56 @@
+ini_section()
+{
+        local inifile="$1"
+        local sec="$2"
+        cat "$inifile" |
+                cut -d\# -f1 |
+                tr -s '\n' '\n' |
+                sed -n "/^ *\[$sec\]/,/^ *\[/ p" |
+                grep -v '^ *\[' |
+		sed '/^ *$/ d'
+}
+
+ini_value()
+{
+	local inifile="$1"
+	local path="$2"
+	local sec=`echo "$path" | sed 's/\.[^.]\+$//'`
+	local key=`echo "$path" | sed 's/.*\.//'`
+
+#	echo "path=>$path<"
+#	echo "sec=>$sec<"
+#	echo "key=>$key<"
+
+	if [ "$key" = "$path" ]; then
+		ini_section "$inifile" "$path"
+		return 0
+	fi
+
+	ini_section "$inifile" "$sec" | sed "
+		/^ *$key *=/ !d
+		s/^ *$key *= *//
+		s/ *$//
+		/^ *$/ d
+	"
+}
+
+ini_has_section()
+{
+	local inifile="$1"
+	local sec="$2"
+	grep -q "^ *\[$sec\]" $inifile || return 1
+}
+
+ini_has_value()
+{
+	ini_value $@ | grep -q .
+}
+
+ini_escape()
+{
+	cat | sed '
+		s/\$/\\$/g
+		s/`/\\\`/g
+	'
+}
+