VENOM-184: Add support for voice and video calls

[naxuroqa]

Fixes #184 Fixes #400 Fixes #464

• Fix a bug in ConversationWindow that hindered you from sending messages on startup
• Add a notice regarding save file location in README.md
• Add Pipelines for microphone (AudioIn), speaker (AudioOut), camera (VideoIn) and display (VideoOut)
• Disable Pipewire device provider and src elements for now (they crash a lot)
• Add a call adapter to handle av calls and provide an additional layer on top of toxav
• Migrate some instances of GLib.HashTable to Gee.HashMap
• Update vapis from https://github.com/naxuroqa/vala-toxcore-c
• Expand SettingsWidget, add options to select devices and some properties (unfinished)
• Add a CallWidget which opens for calls (unfinished)
• Tweak the layouts a bit
• Remove deprecated calls to tox_self_get_connection_status
• Add notifications for incoming calls
• UI elements to
  • Reject calls
  • Display incoming call in conversation widget
  • Display ongoing call in conversation widget
  • Display outgoing call in conversation widget
  • Let the user disable and enable the microphone and camera

TODO: (in other tickets)

• Save the selected device in the settings
• Use the selected devices in the pipelines
• Handle TOXAV_ERR_SEND_FRAME_SYNC errors when sending (research?)
• Fix and handle any errors from toxcore
• Handle devices not being available
• Visualize if the remote has muted himself or disabled video recording (E.g. show a placeholder instead) not possible with current toxcore

Not covered in this PR:

• Hide OSD after some timeout
• Fullscreen support
• Groupchat calls
• React to video_bit_rate and audio_bit_rate changes from toxcore

[codecov-io]

Codecov Report

Merging #463 into develop will decrease coverage by 0.69%. The diff coverage is 0.1%.

@@            Coverage Diff            @@
##           develop    #463     +/-   ##
=========================================
- Coverage     5.43%   4.74%   -0.7%     
=========================================
  Files           81      90      +9     
  Lines         5723    6559    +836     
=========================================
  Hits           311     311             
- Misses        5412    6248    +836

Impacted Files	Coverage Δ
src/view/UserInfoWidget.vala	0% <ø> (ø)	:arrow_up:
src/tox/ToxFiletransferAdapter.vala	16.5% <ø> (ø)	:arrow_up:
src/tox/ToxConferenceAdapter.vala	0% <ø> (ø)	:arrow_up:
src/av/VideoInPipeline.vala	0% <0%> (ø)
src/view/ConversationWindow.vala	0% <0%> (ø)	:arrow_up:
src/av/Pipeline.vala	0% <0%> (ø)
src/core/CallState.vala	0% <0%> (ø)
src/view/ContactListEntryCompact.vala	0% <0%> (ø)	:arrow_up:
src/tox/ToxCallAdapter.vala	0% <0%> (ø)
src/tox/ToxAVThread.vala	0% <0%> (ø)
... and 29 more

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[tiotrom]

Hi. Any update on this? Cheers!