Added current detectors to checkbox, radio and select fields

git-svn-id: https://plugins.svn.wordpress.org/acf-field-selector-field/trunk@864008 b8457f37-d9ea-0310-8a92-e5e31aec5664
Added the option to return the field name

git-svn-id: https://plugins.svn.wordpress.org/acf-field-selector-field/trunk@864179 b8457f37-d9ea-0310-8a92-e5e31aec5664
Added better UI height calculation when placed in tabs and added emty check to API value

git-svn-id: https://plugins.svn.wordpress.org/acf-field-selector-field/trunk@869040 b8457f37-d9ea-0310-8a92-e5e31aec5664