feature(libraries): removed unused packer library

assets/css/style.min.css

-fieldset.settings-field-sender-address{margin:0;padding:0;boder:0}table.sender-address{position:relative;table-layout:fixed;background:#fff;border:1px solid #e5e5e5;box-shadow:0 1px 1px rgba(0,0,0,.04);border-spacing:0;width:100%;clear:both;margin:0}table.sender-address thead td{display:table-cell;padding:1em;vertical-align:top;line-height:1.75em;text-align:left;font-weight:600;text-shadow:none;font-size:14px}table.sender-address tbody td{margin-bottom:9px;padding:15px 10px;line-height:1.3;vertical-align:top;border-top:1px solid #e5e5e5}table.sender-address tfoot td{border-top:1px solid #e1e1e1}table.sender-address tbody tr:nth-child(even) td{background:#f9f9f9}table.sender-address input.non-unique{background:#d62728}table.sender-address tbody td span{display:none}table.sender-address tbody td.non-unique span{display:block}table.sender-address input[type="text"]{max-width:100%;width:100%}table.sender-address input[type="email"]{max-width:100%;width:100%}table.sender-address tbody tr td:first-child select{width:100%}@media only screen and (max-width:600px){table.sender-address tbody tr td:first-child select{width:auto;max-width:100%}table.sender-address,table.sender-address tbody{display:block}table.sender-address thead{display:none}table.sender-address tbody tr td:first-child,table.sender-address thead tr td:first-child{width:100%;display:block}table.sender-address tbody tr,table.sender-address tbody td{display:block;width:100%}}
\ No newline at end of file