Many updates

[oAGoulart]

Done quite a lot today, what is lacking:

Enemy spawn system;
Enemy movement system;
Weapon firing system;
Collision system;

[todo]

Fix color not working on Linux */

ascii-art/src/harvest.c

Lines 257 to 262 in df303a3

	/* TODO: Fix color not working on Linux */
	if ((ulong_t)address <= (ulong_t)(fb->address + fb->size))
	memset(address, color_to_long(fb, color), (fb->var_info.bits_per_pixel / 8));
	#endif
	}
	}

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This comment was generated by todo based on a TODO comment in df303a3 in #16. cc @oAGoulart.