Dark Mode!

Everybody loves dark mode, right? The entire UI was re-themed!

Changelog:

Dark Mode for all platforms!
Packet Starter set! Send immediately after installing!
Macro send support
Qt SDK upgrades
Installer upgrade (windows)
Lowercase executable (now for Mac --others already had it)
Socket race condition fix on persistent TCP
Long-overdue bug fix of empty TCP log entries
Multi-Send removed (was always buggy)
Clipboard copy modal prompt is now a quiet status bar notification
Persistent TCP UI is now a fixed-width font
Lots of compiler warnings cleaned up (the remaining warnings were very recently deprecated. They are left behind those so older compilers can still work.)

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