[MIG] attachment_preview: Migration to 12.0

[REM] Old files

[ADD] Magic to travis file

[FIX] Nagivation refresh widget

attachment_preview/static/src/scss/attachment_preview.scss

@@ -0,0 +1,56 @@
+.o_attachments_list .o_attachment_wrap {
+    .o_attachment_preview {
+        cursor: pointer;
+        float: right;
+        padding-top: 1px;
+        padding-bottom: 1px;
+
+        &.o_attachment_preview_new_tab {
+            right: 43px;
+        }
+    }
+
+    .open .dropdown-menu > li > a {
+        padding-right: 60px;
+    }
+}
+
+.o_form_uri .fa-search {
+    padding-left: 5px;
+    padding-right: 5px;
+}
+
+/* Preview widget */
+
+.o_form_view.attachment_preview {
+    width: 60%;
+    float: left;
+}
+
+.o_form_view + .attachment_preview_widget {
+    width: 40%;
+    height: 100%;
+    float: right;
+    position: relative;
+
+    > .attachment_preview_iframe {
+        width: 100%;
+        height: calc(100% - 30px);
+        float: left;
+    }
+
+    .attachment_preview_buttons {
+        padding: 4px;
+        float: left;
+        width: 100%;
+        background-color: #FFF;
+        border-left: 1px solid $gray-800;
+
+        button {
+            min-width: 25px;
+            min-height: 25px;
+            padding-top: 2px;
+            padding-bottom: 2px;
+        }
+    }
+}