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We moved from the file I/O based terminal handling to SPICE port channels.

Same as with the macOS code.

Resolves utmapp#3473

Now that we use SPICE for terminal mode as well, we can share the USB forward
logic and presentation.

Resolves utmapp#4051

This will be implemented through SPICE port channels.

Once we moved the connection handling to its own queue, we no longer need
the Obj-C styled synchronization code (which probably didn't work anyways).

No longer needed once we moved QMP to SPICE port channel.

In order to change QMP to work over SPICE port channel, a lot of refactoring
has to be done.

1. `vmStartWithCompletion` is refactored to handle change of order in starting
   QMP and SPICE. Previous: SPICE and QMP connected independently in parallel.
   Now: SPICE connects first and returns a QMP manager reference to caller.
2. UTMJSONStream now uses CSPortDelegate instead of NSStreamDelegate.
3. Retry logic is removed from UTMQemuManager and implemented in UTMSpiceIO.
   The logic is re-done.
4. Fixed a bug causing busy indicator to hang when force stopping a busy VM.

Note UTMTerminalIO is broken with this commit and will be addressed in the
future.

Resolves utmapp#3687

Due to bad logic in SPICE, any device with address 0x1 is ignored.

Fixes utmapp#3975

Fixes utmapp#4018

Fixes utmapp#4023

Due to an SwiftUI bug (FB9960294), an .aspectRatio() inside a ScrollView
breaks whenever "Always" show scroll bars is set in system settings.

The workaround detects when this setting is active and hides the scrollbar.

Fixes utmapp#3612

The QEMU build conditionally compiles out the new vmnet features.

Fixes utmapp#4022

Disable the code until we can better triage it.

See utmapp#4009

This is to be consistent with the UI.

Fixes utmapp#3945

Fixes utmapp#3919

Fixes utmapp#3968

Fixes utmapp#3940

utmapp#3934)