added drawing files for Retro Windows visual style #4

src/toolbox/drawing.c

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+#include "drawing.h"

src/toolbox/drawing.h

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+#ifndef DRAWING_H
+#define DRAWING_H
+
+#include <vita2d.h>
+
+/**
+ * @brief draws a line with a specified width
+ * 
+ * @param x0 the start x coordinate of the line
+ * @param y0 the start y coordinate of the line
+ * @param x1 the end x coordinate of the line
+ * @param y1 the end y coordinate of the line
+ * @param thiccness the width of the line
+ * @param color the color of the line
+ */
+void drawing_draw_line_thiccness(float x0, float y0, float x1, float y1, int thiccness, unsigned int color);
+
+/**
+ * @brief draws an open rectangle
+ * 
+ * @param x the top left x position of the rectangle
+ * @param y the top left y position of the rectangle
+ * @param width the width of the rectangle
+ * @param heigth the heigth of the rectangle
+ * @param thiccness the width of the lines of the rectangle
+ * @param color the color of the rectangle
+ */
+void drawing_draw_rectangle_open(float x, float y, float width, float heigth, int thiccness, unsigned int color);
+
+#endif // !DRAWING_H