Close #10, #6, #5

[oAGoulart]

Fix segmantation fault on Linux
Fix rect drawing function
Add 8-bit color support for put_pixel
Add clear_screen function

[todo]

change to a better approche than SetPixel (this is painful slow) */

ascii-art/src/harvest.c

Lines 230 to 235 in baa09fb

	/* TODO: change to a better approche than SetPixel (this is painful slow) */
	SetPixel(fb->device, position.x, position.y, RGB(color, color, color));
	#else
	void* address = fb->address + (position.y * fb->fix_info.line_length) + (position.x * 4 + 4);
	if ((ulong_t)address <= (ulong_t)(fb->address + fb->size))

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This comment was generated by todo based on a TODO comment in baa09fb in #11. cc @oAGoulart.