main ui: action-based hotkey system, add swap_jk plugin

plugins/swap_jk/swap_jk.php

@@ -0,0 +1,29 @@
+<?php
+class Swap_JK extends Plugin {
+
+	private $link;
+	private $host;
+
+	function about() {
+		return array(1.0,
+			"Swap j and k hotkeys (for vi brethren)",
+			"fox");
+	}
+
+	function init($host) {
+		$this->link = $host->get_link();
+		$this->host = $host;
+
+		$host->add_hook($host::HOOK_HOTKEY_MAP, $this);
+	}
+
+	function hook_hotkey_map($hotkeys) {
+
+		$hotkeys["j"] = "next_feed";
+		$hotkeys["k"] = "prev_feed";
+
+		return $hotkeys;
+
+	}
+}
+?>