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/roles.page

@@ -0,0 +1,36 @@
+<page>
+<title>Quality Iron - Roles</title>
+<contents>
+<retain name="selected_role_id">
+<div>
+<h1>USER ROLES</h1>
+<sql>select r.*,
+           (select count(*) from user_roles ur where ur.role_id=r.id) as count
+      from roles r
+        order by description</sql>$[sqlerror]
+<table id="role_table">
+<tr>
+<th></th>
+<th style="text-align: left;">Description</th>
+<th style="text-align: left;">Used</th>
+<th></th>
+</tr>
+<whilerow>
+<tr>
+<td>
+<if value1="$[.count]" value2="0" type="eq">
+<linkbutton process="deleterole" name="selected_role_id" value="$[.id]"><img width="18" style="cursor: pointer;" src="/assets/delete.png"></linkbutton>
+</if>
+</td>
+<td><input type="text" name="description$[.id]" size="20" value="$[.description]"></td>
+<td>$[.count]</td>
+<td><linkbutton process="updaterole" name="selected_role_id" value="$[.id]">Save</linkbutton></td>
+</tr>
+</whilerow>
+</table>
+<h2>Add Role</h2>
+<input type="text" name="new_role_description" size="20" value="">
+<abutton process="createrole">Add</abutton>
+</div>
+</contents>
+</page>