Gulf exchanges, MCX futures and live G-sec prices

[iamsaquib8]

An idea, not planned yet.

• Saudi Tadawul (-m sa, Sunday–Thursday week) and UAE DFM/ADX (-m ae) for NRIs in the Gulf.
• MCX commodity futures and live individual G-sec and T-bill prices. No free public feed exists, so this would come through optional broker data feeds (data: use the user's own broker API for quotes when they are logged in #253).
  Comment if you would use this.

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Moved from issue #276 to keep the issue tracker for scheduled work. Upvote or comment if you would use this; ideas with demand go back on the roadmap.