VENOM-166: Queued offline messages

[naxuroqa]

Closes #166

• Refactor some interfaces to remove the I prefix.
• Refactor some method names from camel case to snake case
• Add ToxMessageRepository to persistently store messages
• Remove interfaces from Interfaces.vala
• Rename Logger implementation to CommandLineLogger
• Refactor Message class to be closer to the database entity
• Split IMessage interface into a database entity and formatting functions
• Move ContactRepository.vala to SqliteContactRepository.vala
• Replace some instances of GLib.List with Gee.Iterable
• Add queued offline messages to ToxAdapterFriendListener
• Move ToxMessage class to ToxMessage.vala
• Refactor Settings widget, move dht nodes to its own page

[codecov-io]

Codecov Report

Merging #420 into develop will decrease coverage by 1.17%. The diff coverage is 2.65%.

@@            Coverage Diff             @@
##           develop    #420      +/-   ##
==========================================
- Coverage     7.26%   6.09%   -1.18%     
==========================================
  Files           76      77       +1     
  Lines         4999    5073      +74     
==========================================
- Hits           363     309      -54     
- Misses        4636    4764     +128

Impacted Files	Coverage Δ
src/plugin/Pluginregistrar.vala	100% <ø> (ø)	:arrow_up:
src/core/Tools.vala	13.2% <ø> (ø)	:arrow_up:
src/view/FileTransferEntry.vala	0% <0%> (ø)	:arrow_up:
src/view/UserInfoWidget.vala	0% <0%> (ø)	:arrow_up:
src/tox/StaticDhtNodeUpdater.vala	0% <0%> (ø)
src/tox/ToxMessage.vala	0% <0%> (ø)
src/view/ConversationWindow.vala	0% <0%> (ø)	:arrow_up:
src/tox/SqliteDhtNodeRepository.vala	0% <0%> (ø)	:arrow_up:
src/view/FileTransferWidget.vala	0% <0%> (ø)	:arrow_up:
src/view/AddContactWidget.vala	0% <0%> (ø)	:arrow_up:
... and 54 more

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