[tools] Add generate_subways.sh script

Signed-off-by: Konstantin Pastbin <konstantin.pastbin@gmail.com>

tools/unix/maps/helper_settings.sh

@@ -0,0 +1,25 @@
+SETTINGS_FILE="${SETTINGS_FILE:-$(cd "$(dirname "$0")"; pwd -P)/settings.sh}"
+if [ -f "$SETTINGS_FILE" ]; then
+  echo "Using settings from $SETTINGS_FILE"
+  source "$SETTINGS_FILE"
+else
+  echo "Creating a template settings file $SETTINGS_FILE"
+  cat << EOF > "$SETTINGS_FILE"
+# Customize the default settings here.
+# (check the defaults in settings_default.sh)
+
+# The default maps workspace base is ../maps relative to the repo.
+# All source and output and intermediate files will be organized there in corresponding subdirs.
+# E.g. set it to the user's home directory:
+# BASE_PATH="$HOME"
+EOF
+fi
+
+source "$(dirname "$0")/settings_default.sh"
+
+mkdir -p "$BASE_PATH"
+mkdir -p "$BUILD_PATH"
+mkdir -p "$DATA_PATH"
+
+mkdir -p "$PLANET_PATH"
+mkdir -p "$SUBWAYS_PATH"