Changed font file to a public-domain one.

Added custom events/callbacks.
Split project into library and run script to demonstrate and test the event API.

run.py

@@ -0,0 +1,54 @@
+import pixelflut
+
+
+def guess_IP():
+    import socket
+    s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
+    try:
+        s.connect(("google.com", 80))
+        return s.getsockname()[0]
+    finally:
+        s.close()
+
+
+port = 2342
+text  = 'P1XELFLUT! v%s\n' % pixelflut.__version__
+text += 'Connect to %s:%d\n\n' % (guess_IP(), port)
+text += '>>> SIZE\n'
+text += '>>> PX x y hex-color\n'
+text += '... and more ...\n\n'
+text += 'H A C K  O N\n'
+
+canvas = pixelflut.Canvas()
+
+@canvas.on('START')
+def callback(c):
+    c.load_font('./font.png')
+    pixelflut.async(c.text, 5, 5, text, delay=0.1)
+
+@canvas.on('RESIZE')
+def callback(c):
+    c.text(5, 5, 'Screen Size: %dx%d' % c.get_size())
+
+@canvas.on('CONNECT')
+def callback(c, client):
+    c.text(5, 5, 'Connect: %s' % client.address[0])
+
+@canvas.on('KEYDOWN-c')
+def callback(c):
+    c.clear()
+
+@canvas.on('KEYDOWN-s')
+def callback(c):
+    import os
+    i, mask = 0, 'screen%05d.png'
+    while os.path.exists(mask%i): i += 1 
+    c.save_as(mask%i)
+    c.text(5,5, 'Saved as %s' % mask % i)
+
+@canvas.on('COMMAND-CLEAR')
+def callback(canvas, client, *args):
+    canvas.clear()
+
+task = canvas.serve('0.0.0.0', port)
+task.join()