use data-plugin to define the data collector (server side api/plugins/ plugin) and data-callback to define the javascript function to call after receiving data.
The callback uses 2 parameters (sender, remote data), where sender is the dom attribute on which the data-plugin was defined

(dashboard) the weirdness around stats.inc, getstats.php and ajax.js needs to be replaced with a more structural solution.

Because all current widgets depend on legacy code and we don't want to pollute new style mvc code with it, we choose to build a new broker in the old structure.
This commit only includes the basic setup for the broken and an empty gateway_api() function

still need to add a selectable number of columns (col-md-6 fixed now)

This reverts commit ed81dd30.
The state of digit validation is highly controversial.  I give
up.  :)

While this is a neat milestone, it becomes apparent how convuluted
the code path and interface info polling is.  Looking at it, the
whole interface layer can probably make performance jumps to at least
twice the read or reconfigure speed...