Revamp gui component

`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.

1 files changed, 0 insertions, 36 deletions

diff --git a/src/button/inc/button.h b/src/button/inc/button.h
deleted file mode 100644
index 062cb07..0000000
--- a/src/button/inc/button.h
+++ /dev/null
@@ -1,36 +0,0 @@
-#ifndef BUTTON_H
-#define BUTTON_H
-
-#include <gfx.h>
-#include <stdbool.h>
-
-#ifdef __cplusplus
-extern "C"
-{
-#endif
-
-enum
-{
-    BUTTON_LEFT,
-    BUTTON_MID,
-    BUTTON_RIGHT,
-
-    MAX_BUTTON_SPRITES
-};
-
-struct button
-{
-    const char *text;
-    short x, y, w;
-};
-
-bool button_is_pressed(const struct button *b);
-int button_render(const struct button *b);
-
-extern struct sprite button_sprites[MAX_BUTTON_SPRITES];
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif /* BUTTON_H */