App dependencies php version

First app dependencies just arrived: minimum and maximum php versions and supported databases:

```xml
	<dependencies>
		<php>
			<min-version>5.4</min-version>
			<max-version>5.4</max-version>
		</php>
		<database>sqlite</database>
		<database>mysql</database>
	</dependencies>

indeed - only the parsing is tested at the moment - I already feel this PR getting toooo big that's why I stopped here - not optimal for sure :see_no_evil: