Add sh_stext_t to implement a simple version of text shape. - It is still under construction. - It is supposed to be a simple, less dependency implementation. - It is more less functional than sh_text_t.

<project>
	<scene src="/tmp/scene.mbsvg"/>
	<scene src="/tmp/second.mbsvg"/>
	<source src="/tmp/main.c"/>
	<source src="/tmp/second.c"/>
</project>