Upload picture accept types

Hi @julianlam

Please consider adding accept to the file input:

1. In formatting.js (composer) add picture: function() as follows:

var formattingDispatchTable = {
		picture: function () {
			var postContainer = this;
			postContainer.find('#pictures').click();
		},

		upload: function () {
			var postContainer = this;
			postContainer.find('#files').click();
		},

2. In composer.tpl (that I copied from redactor ;) ) add input with id=pictures:

<form id="fileForm" method="post" enctype="multipart/form-data">
						<!--[if gte IE 9]><!-->
						<input type="file" id="files" name="files[]" multiple class="gte-ie9 hide"/>
						<input type="file" id="pictures" accept="image/*, video/*" name="files[]" multiple class="gte-ie9 hide"/>
						<!--<![endif]-->
						<!--[if lt IE 9]>
						<input type="file" id="files" name="files[]" class="lt-ie9 hide" value="Upload"/>
						<input type="file" id="pictures" accept="image/*, video/*" name="files[]" class="lt-ie9 hide" value="Upload"/>
						<![endif]-->
					</form>

A better way is to use the ACP defined mime types for files and pictures, but I have not been able to find such field in config.
Thanks!

Start with formatting.js and composer.tpl, focusing on the formatting dispatch table and the existing #files input shown in the issue. Compare the requested picture entry and input behavior with the current composer implementation. Done means picture uploads have their own input accepting image and video types without changing the existing file-upload path.