--------------
                              Lots of things to do
                                 --------------

  @    known bugs
  +    simple improvements
  -    important milestones
  ~    needs investigation


@  vram overflow
@  keyboard test threading interface

+  use alloca() for tales
+  call exit handlers
+  compute frequencies
+  gray text
+  effective rtc callback
+  properly test gray drawing
+  upgraded blending modes
+  blending modes for text
+  information masks for text
+  test all font encodings
+  font clipping
+  bitmap parts
+  bitmap clipping

-  write and test gray engine
-  full rtc driver (time)
-  callbacks and complete user API

~  shadowy rectangle effect for Shift + Alpha + Left + Down
~  exhaustive save for setjmp()
~  registers that need to be saved when configuring gint
~  possible bug when -O2 __attribute__((interrupt_handler))