wavehunter: adds static server, system stats

This commit does a couple things:

1. breaks out the pcap streaming logic into its own module
2. bundles wavehunter/static files into the binary for easy distribution
3. serves those static files
4. serves dynamic json representing system and diag stats

I also threw together the world's ugliest website to display all this.

wavehunter/static/js/main.js

@@ -0,0 +1,24 @@
+async function populateDivs() {
+    const systemStats = await getSystemStats();
+    const diagStats = await getDiagStats();
+
+    const systemStatsDiv = document.getElementById('system-stats');
+    const diagStatsDiv = document.getElementById('diag-stats');
+
+    systemStatsDiv.innerHTML = JSON.stringify(systemStats, null, 2);
+    diagStatsDiv.innerHTML = JSON.stringify(diagStats, null, 2);
+}
+
+async function getSystemStats() {
+    return await getJson('/api/system-stats');
+}
+
+async function getDiagStats() {
+    return await getJson('/api/diag-stats');
+}
+
+async function getJson(url) {
+    const response = await fetch(url);
+    const data = await response.json();
+    return data;
+}