Create an image with a text (textonly no background picture)
<li>t : text (you can use \n for new line) [ex: t=frist line\nsecond line] </li>
<li>c : text colour in FFFFFF format (shadow text color is automatically set to black or white for readability)</li>
<li>f : font used</li>
<li>fs: fontsize in pixels</li>
<li>vertical: rotate picture to print it as a banner (in thermic little printers ^^)</li>

<li>dontsave: avoid saving rendered picture</li>
<li>force: force the rendering even if the picture already exists (previous rendering)</li>
<li>help: displays this text</li>
<li>version: displays this api's version</li>
<li>
	picslist: returns the rendered images list in json format
	<ul>
		<li>&random[=xx]: limit the list getting only xx rendered pictures</li>
	</ul>
</li>
<li>fontslist: returns available fonts list in json format</li>
<li>download: downloads the php api file</li>