Synchronise the filters with the GET parameters

[dantownsend]

There's a little known feature in Piccolo admin where you can filter the row listing page using GET params. For example:

/#/movie?won_oscar=true

However, these values aren't synchronised with the filter sidebar:

• When the page loads, the filter sidebar doesn't display the values in the GET params
• When the filter sidebar values change, the GET params don't update accordingly

Having this work properly would be a nice feature. It will allow a user to do the following:

• Load the listing page, and apply some filters
• Click on one of the results, and edit it
• Press the back button, and the same filters will still be applied

[sinisaos]

@dantownsend If you want I can do PR for this in the evening. I tried it and it needs a little change to make it work.

[dantownsend]

@sinisaos That would be great, thanks