Add simple documentation in comments, refactor.

Change all `unsigned int` and `unsigned long` types to `size_t`.
Fix names alignment in headers.

Add documentation and simple description:
Painter - painter.h
Main - tetris.c
Unicode - unicode.h
IDList - idlist.h
Engine - engine.c

Minor changes:
tetris.c - fix indentation and code blocks separation with newlines,
remove unused includes.
idlist.h - fix structure field name alignment.
field.h, engine.c - define aliases for ghost and active shapes indexes
in the field.
engine.c - rename menuTick to snake case, fix curly braces style of
functions.
Makefile - switch SFML deprecated warnings off.

1 files changed, 36 insertions, 11 deletions

diff --git a/include/painter.h b/include/painter.h
index 7bcb47a..fc01092 100644
--- a/include/painter.h
+++ b/include/painter.h
@@ -1,15 +1,40 @@
-void          painter_set_window(sfRenderWindow *window);
+/*
+ * painter.h
+ *
+ * Painter is a module for drawing tetris objects on a window. It is implemented
+ * as a singletone as OO programmers speak. It internally has global static
+ * arrays for objects referenced by handles. You register an object and get a
+ * handle (id) which can be used for updating an object - modifying it's
+ * drawable representation. Painter is used as described in following steps:
+ *
+ * 1. At first assign a window via painter_set_window() function.
+ * 2. Load a font if you are going to draw any text.
+ * 3. Register an object (field, text, etc.) using painter_register_*()
+ *    function.
+ * 4. Update an object attribute using painter_update_*() function. Update all
+ *    your objects for next frame before drawing.
+ * 5. Draw everything using painter_draw() function. Objects are drawn in order
+ *    they were registered.
+ * 6. At the end you must destroy your drawable objects and fonts. Objects are
+ *    registered each in it's own way, but have unified interface for
+ *    destroying - painter_destroy_drawable() function. You can destroy them
+ *    all at once using painter_destroy_drawables() function or even destroy
+ *    everything that has been allocated by the Painter, even loaded fonts.
+ *
+ * */
 
-void          painter_load_font(char *filename);
-void          painter_destroy_font();
+void    painter_set_window(sfRenderWindow *window);
 
-unsigned long painter_register_field(struct field *fld);
-void          painter_update_field(unsigned long id, struct field *fld);
-unsigned long painter_register_text(struct text *txt);
-void          painter_update_text(unsigned long id, struct text *txt);
+void    painter_load_font(char *filename);
+void    painter_destroy_font();
 
-void          painter_draw();
+size_t  painter_register_field(struct field *fld);
+void    painter_update_field(size_t id, struct field *fld);
+size_t  painter_register_text(struct text *txt);
+void    painter_update_text(size_t id, struct text *txt);
 
-void          painter_destroy_drawable(unsigned long id);
-void          painter_destroy_drawables();
-void          painter_destroy_all();
+void    painter_draw();
+
+void    painter_destroy_drawable(size_t id);
+void    painter_destroy_drawables();
+void    painter_destroy_all();