Add global music player, invoicing/payment system, account subpages, mail account admin, and the qualityiron.vegas Jet 2.0 port

Jet interpreter (Tag.cpp, __call.cpp, __imap*.cpp/h, __smtpsend.cpp/h,
__imapemptyfolder.cpp/h - new): assorted parser/tag fixes found across
this work - a stray literal-tag-in-comment and backslash-quote parser
corruption class, a dangling-pointer fix, a __call.cpp fd leak, IMAP
folder-management tags, multi-account/per-host IMAP support, and a
smtpsend Message-ID fix.

barant.com site (jetc/barant-site/):
- A site-wide persistent music player (header band, playlist/queue,
  stereo FFT EQ, session-persisted state) fed by new library/
  ianslibrary/music song-list subpages.
- /account split into info/phones/invoices subpages; a full invoicing
  and Square payment system (create/edit/copy/pay/email invoice);
  admin invoice management and mail-account management subpages.
- /services split into overview/hosting/siptrunking/documents
  subpages, retiring the old standalone pages.
- SIPPHONE.tag: a Jet 2.0 WebRTC softphone tag.
- main.css/spa.js/email.js: the SPA loading indicator, the music
  player band styling, and assorted fixes accumulated alongside this
  work.

qualityiron-site/: the qualityiron.vegas job/contractor/customer/
document management app, ported from its original Jet 1.4 codebase to
Jet 2.0 as barant.coms APIServers second multi-tenant site.

wcwc/wcwc.jet: the WCWC site Jet source (wcwc.jtc build output not
included).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

jetc/qualityiron-site/src/customers.page

@@ -0,0 +1,58 @@
+<page>
+<title>Quality Iron</title>
+<contents>
+<script>
+function setrows(include) {
+   var table = document.getElementById("list");
+   for (var i = 1; row = table.rows[i]; i++) {
+      if(include == "") {
+         row.style.visibility = "visible";
+      } else {
+         row.style.visibility = "collapse";
+      }
+      for (var j = 0; col = row.cells[j]; j++) {
+            if(col.innerHTML.toUpperCase().includes(include.toUpperCase())) {
+               row.style.visibility = "visible";
+            }
+
+      }
+   }
+}
+</script>
+<retain name="selected_customer_id">
+<div>
+<h1>CUSTOMERS</h1>
+<div style="padding: 5px;">
+<div style="display: inline-block;"><linkbutton page="createcustomer">Create Customer</linkbutton></div>
+<sql>
+    select *,
+           date_format(convert_tz(created,'UTC','America/Los_Angeles'), "%W, %M %D, %Y %l:%i%p") as created_date
+      from customers
+  order by name</sql>$[sqlerror]
+<ifrow>
+<div style="display: inline-block;">Customers</div>
+ <div style="border-radius: 5px; display: inline-block; background: #345; color: #def; margin-left: 20px; padding: 5px;">
+   <img style="margin-top: 3px;" src="/assets/magglass.png" width="20px;" align="top">
+  <input style="font-size: 20px; color: #def;" type="text" size="10" name="search" value="" onkeyup="setrows(this.value); return true;">
+ </div>
+</div>
+<div>
+<table id="list">
+<tr>
+<th></th>
+<th>Name</th>
+<th>Created</th>
+</tr>
+<whilerow>
+<tr style="visibility: table-row">
+<td><linkbutton page="customer" process="selectcustomer" name="selected_customer_id" value="$[.id]">Open</linkbutton></td>
+<td>$[.name]</td>
+<td>$[.created_date]</td>
+</tr>
+</whilerow>
+</table>
+</div>
+</ifrow>
+</div>
+</contents>
+</page>