Clocks (#461)

* Added a big clock

* fixed clock timing when animation is turned off

* fix memory leak and segfault

* rename clock to bigclock

* Added formattable clock

* fix clock position on first draw

don't rely on box_x and box_y to position the clock, because it might not be initialized in the first frame.

* fix memory leak

res/config.ini

@@ -6,6 +6,11 @@
 # 1 -> CMatrix 
 #animation = 0
 
+# format string for clock in top right corner (see strftime specification)
+#clock = %c
+
+# enable/disable big clock
+#bigclock = true
 
 # The character used to mask the password
 #asterisk = *