implemented removal of project members

frontend/src/Components/MemberEditor.svelte

@@ -6,6 +6,7 @@
     let {
         members,
         updatePermission = (uid,perm) => console.log(`no handler for updatePermission(${uid}, ${perm})`),
+        dropMember       = (member)   => console.log(`no handler for dropMember(${member})`),
         addMember        = (entry)    => console.log(`no handler for addMember(${entry})`)
     } = $props();
     let error = $state(null);
@@ -59,6 +60,9 @@
             <td>{member.user.name}</td>
             <td>
                 <PermissionSelector {permissions} selected={member.permission.code} onchange={(perm) => updatePermission(member.user.id,perm)} />
+                {#if member.permission.name != 'OWNER'}
+                <button onclick={() => dropMember(member)}>x</button>
+                {/if}
             </td>
         </tr>
         {/each}