Added blinking cursor and settings

* The cursor can now be controlled with the cursor command,
  documented in examples and in scripting docs.

examples/cursorblink.ftm

@@ -0,0 +1,27 @@
+set terminal 60x10
+set colors 16
+set typedelay 250
+set fps 30
+
+cursor blink 500
+cursor show
+
+delay 2000
+
+type "We have a cursor!"
+
+delay 2000
+
+type <return>
+
+cursor style solid
+type "We can even change the style..." <return>
+
+cursor blink 0
+type "And we can make it blink not at all..."
+delay 1000
+cursor blink 100
+type " or like its life depended on it!"
+delay 2000
+
+

examples/keys.ftm

@@ -1,5 +1,6 @@
 set terminal 80x25
+cursor style solid
 
 showkeys ctrl alt shift F4 up up down down left right left right B A
 
-savepng keys.png
+savepng keys.png