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Checking against `sel` is just plain wrong, since it always expected to
be non-NULL, since `h->sel` is an array defined in `struct
human_player`. Instead, `sel->d.i` is the pointer that should be
checked.
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`gui` was tighly coupled to game logic, and could not be extended for
other purposes. Therefore, a generic GUI implementation, loosely
inspired by well-known GUI frameworks such as GTK, is now provided, with
the following properties:
- Does not depend on dynamic or static memory allocation, only automatic
(i.e., stack) memory allocation required.
- Portable among existing implementations.
- Simple to extend.
- Tiny memory footprint.
`gui` is now composed by GUI elements that can be chained to form a tree
structure. This is useful e.g.: to calculate X/Y coordinates for a given
GUI element given its parent(s).
This commit also refactors the older implementation, moving
game-specific logic into `player` and making use of the new component.
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Using memset(3) does not ensure pointers are assigned to NULL for all
platforms.
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- All platforms should allow for the same resources.
- Population is not expected to exceed UCHAR_MAX on any platform.
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Whereas some actions are context-specific (e.g.: selecting a player),
some are context-independent and can be executed for all screens
(e.g.: exiting the game).
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This will allow using camera for purposes other than showing the game
map.
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This has several advantages:
- `camera` no longer needs to define public functions for each
peripheral type.
- Peripheral-related is now no longer tighly coupled to human_player,
so peripheral logic can be reused elsewhere e.g.: on menus.
- Makes camera_update_touch consistent compared to equivalent functions,
since now `pan` has now been moved to `camera` (as it should be).
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