Implement sequence/get API endpoint.

It returns data for all individual points in a sequence.

lib/www/server/api/middleware/sequence/get/index.js

@@ -0,0 +1,23 @@
+const json = require('./json');
+const geojson = require('./geojson');
+
+module.exports = async function (req, res, next) {
+	try {
+		const handlers = {
+			"application/json": json,
+			"application/geo+json": geojson,
+		};
+		
+		const mimetype = (handlers[req.query.mime] && req.query.mime) || req.accepts(Object.keys(handlers));
+		
+		if (mimetype) {
+			res.set("Content-Type", mimetype);
+			await handlers[mimetype](req, res, next);
+		} else {
+			res.status(406).send();
+			next();
+		}
+	} catch (err) {
+		next(err);
+	}
+}