[ALOY-925] XML: Allow for in-line script blocks

It is often useful to have the UI and controller code all in a single page. This is especially handy when trying to show the most compact form of an application with simple logic, such as when filing a bug report, or doing a demo. Flex allowed for a similar option in its XML files, as noted here: http://help.adobe.com/en_US/flex/using/WS2db454920e96a9e51e63e3d11c0bf61c8a-7fff.html#WS2db454920e96a9e51e63e3d11c0bf61c8a-7ffb If styling is required, that could be done inline as attributes on tags, rather than having a separate