Add wordpress-plugin tag for composer installers.

Add custom tag `wordpress-plugin` for use with composer installers.

See: https://github.com/composer/installers#current-supported-types
Merge pull request #468 from oswaldoacauan/patch-1

Add wordpress-plugin tag for composer installers.
Fix reorder images in plupload_image field #470 #469
Change filter name for helper & shortcode functions #472
Fix JS loading issues of jQuery UI Datepicker/Timepicker locale files with alternate names (e.g. name-de.js instead of name-de-DE.js) for date and time fields.
Merge pull request #475 from mirozoo/master

jQuery UI Datepicker/Timepicker locale files...
Remove sanitize_key filter for inputs as it changes the field ID if field ID contains uppercase letters. #466
Fix undefined variable
Fix not saving meta caused by page template issue. #360
Version 4.3.10
Merge pull request #1 from rilwis/master

merge