Add drop, sort commands, start tail command; implement support for destructuredOrLines match type; misc fixes

src/vm/commands/unique.ts

@@ -18,7 +18,7 @@ export class Unique extends Command<{}> {
 
     execute(vm: StrVM): Awaitable<StrVM> {
         return vm.replaceContextMatchingTerm({
-            destructured: sub => {
+            destructuredOrLines: sub => {
                 const seen: Record<string, boolean> = {}
                 return sub.filter(part => {
                     const hash = hashStrRVal(wrapString(part.value))