gint/TODO

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Bugs to fix:
- Left-vram overflow when rendering text
- A few key hits ignored after leaving the application (could not reproduce)
- Lost keyboard control at startup (could not reproduce)
Simple improvements:
- bopti: Monochrome bitmaps blending modes
- bopti: Partial transparency
- demo: Try 284x124 at (-60, -28) (all disadvantages)
- display: Rectangle-based drawing functions
- tales: Test all font encodings
- time: Compute CLOCKS_PER_SEC
- timer: Add duration and frequency settings
- core: Add VBR handlers debugging information (if possible)
- core: Implement all callbacks and a complete user API
- project: Enhance Makefile install_lib rules
Modules to implement:
- Serial communication
- Sound playback and synthesizing
- Handle errors within errno
Things to investigate:
- Packed bit fields alignment
- Registers that may need to be saved within setjmp()
- Registers that may need to be saved and restored by gint
- Possible bug when optimizing __attribute__((interrupt_handler))
Configuration:
- ATEXIT_MAX (16)
- RTC_CB_ARRAY_SIZE (5)
- EVENTS_QUEUE_SIZE (64)
- GINT_NO_SYSCALLS (undefined)