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

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


@  vram overflow
@  keyboard test threading interface

+  gint vs. ML with 248x124 at (-60, -28)
+  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

-  install critical failure handler to prevent failing resets
-  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))



Some notes
----------

Test cases for bitmap drawing:
- aligned 32 / non-aligned 32
- monochrome / gray
- small / large
- does not overflow / overflows
# blending modes