Rewrite, cleanup and bugfixes

* More events added, constants cleaned up
* Events now handled using noccylabs/tinyevent
* Fixed magenta/cyan mixup in style
* Fixed LineRead not resetting history pointer on command

examples/basic.php

@@ -1,12 +1,36 @@
 <?php
+/*
+ *  Basic shell example, demonstrates adding a listener to update the prompt with
+ *  the current time as well as creating an "anonymous" context and adding a
+ *  command to it. It also shows how to change the style of the prompt.
+ *
+ */
 
 require_once __DIR__."/../vendor/autoload.php";
 
 use NoccyLabs\Shell\Shell;
+use NoccyLabs\Shell\Style;
 use NoccyLabs\Shell\Context;
 
-
 $myShell = new Shell();
+
+// Set the style of prompt and input
+$myShell->setPromptStyle(new Style(Style::BR_GREEN, Style::GREEN));
+$myShell->setInputStyle(new Style(Style::BR_CYAN));
+
+// Add a listener to update the prompt
+$myShell->addListener(Shell::EVT_UPDATE_PROMPT, function ($e) {
+    $e->shell->setPrompt(date("H:i:s").">");
+});
+
+// Set the initial prompt, not really needed.
 $myShell->setPrompt("test>");
-$myShell->pushContext(new Context());
+
+// Create an anonymous context and add a command
+$ctx = $myShell->createContext("root");
+$ctx->addCommand("hello", function () {
+    echo "Hello World!\n";
+});
+
+// Run the shell
 $myShell->run();