qrexec-client-vm: add option to replace control characters on stdout/err

[marmarek]

And enable it by default when stdout/stderr is connected to terminal.

Fixes QubesOS/qubes-issues#5322

[codecov-io]

Codecov Report

Merging #9 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master       #9   +/-   ##
=======================================
  Coverage   87.98%   87.98%           
=======================================
  Files          15       15           
  Lines        2506     2506           
=======================================
  Hits         2205     2205           
  Misses        301      301

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[qubesos-bot]

OpenQA test summary

Complete test suite and dependencies: https://openqa.qubes-os.org/tests/4203#dependencies

Failed tests

• system_tests_extra
  • TC_10_AppmenusIntegration: test_011_icon_color_label_change
  • TC_10_Thunderbird_fedora-30: test_000_send_receive_default
  • TC_10_Thunderbird_whonix-ws-15: test_000_send_receive_default
  • TC_00_USBProxy_debian-10: test_020_detach_on_remove
  • TC_20_USBProxy_core3_fedora-30: test_061_auto_attach_on_reconnect
• system_tests_pvgrub_salt_storage
  • TC_40_PVGrub_debian-10: test_000_standalone_vm
  • TC_40_PVGrub_debian-10: test_010_template_based_vm
  • TC_40_PVGrub_fedora-30: test_000_standalone_vm
  • TC_40_PVGrub_fedora-30: test_010_template_based_vm
  • TC_41_HVMGrub_fedora-30: test_000_standalone_vm
  • TC_41_HVMGrub_fedora-30: test_010_template_based_vm
• system_tests_network
  • VmNetworking_debian-10: test_113_reattach_after_provider_kill
  • VmNetworking_fedora-30: test_112_reattach_after_provider_shutdown
  • VmIPv6Networking_debian-10: test_100_late_xldevd_startup
  • VmIPv6Networking_debian-10: test_112_reattach_after_provider_shutdown
  • VmIPv6Networking_debian-10: test_113_reattach_after_provider_kill
  • VmIPv6Networking_debian-10: test_114_reattach_after_provider_crash
  • VmIPv6Networking_fedora-30: test_112_reattach_after_provider_shutdown
  • VmIPv6Networking_fedora-30: test_113_reattach_after_provider_kill
  • VmIPv6Networking_fedora-30: test_114_reattach_after_provider_crash
• system_tests_basic_vm_qrexec_gui
  • TC_00_Basic: test_120_start_standalone_with_cdrom_dom0
  • TC_00_Basic: test_201_shutdown_event_race
  • TC_06_AppVM_debian-10: test_121_start_standalone_with_cdrom_vm
  • TC_06_AppVM_fedora-30: test_121_start_standalone_with_cdrom_vm
  • TC_06_AppVM_whonix-gw-15: test_121_start_standalone_with_cdrom_vm
  • TC_06_AppVM_whonix-ws-15: test_121_start_standalone_with_cdrom_vm
  • TC_00_AppVM_fedora-30: test_221_audio_record_muted
  • TC_00_AppVM_fedora-30: test_222_audio_record_unmuted