MISC: Separate implementation of the different classes of Log.hh into multiple namespace Vivy{} in the Log.cc file

LOG: Send the messages to the queue in a thread safe way, clear the loggers from sink cache on destruction

This is a slightly more complicated logger than what is done for lektor.
The process to create a logger is the following:

{ // In scope
std::shared_ptr<LogSink> mySink   = VIVY_NEW_LOG_SINK();
std::shared_ptr<Logger> appLog    = VIVY_GET_LOGGER(mySink, "APPLICATION");
std::shared_ptr<Logger> scriptLog = VIVY_GET_LOGGER(mySink, "SCRIPT");
// ...
VIVY_LOG_WARN(appLog) << "This is" << ' ' << "very usefull!";
// ...
} // Will clear all loggers

MISC: Can now use qDebug() with std::string and std::string_view, VIVY_ASSERT_STRING is now a qFatal

Implement the VivyDocument specification

See merge request !18

XXX: Still not closing floating docs on window close

UI: The property model takes into account the "ordered QJsonObjects" that are nothing more than QJsonArray with each element being a single QJsonObject

UTILS: Add a json builder object to hold some useful functionalities like create a QJsonArray that will be interpreted as an ordered QJsonObject by the property viewer

Those buttons seems to only work with the MPV view for some strange
reasons (don't hover with other views), so disable them for all. Now the
'float' operation is done by double-clicking and the close is done with
the view menu.

- Don't show the 'Open properties' action in views when it can be
  toggled by the QDockWidget's action
- Use constexpr things to group all dock features -> easy to view and
  understand now

- Disable the subobject linkage warning for gcc.
- Solves one shadowing pb
- Delete unused DataPtr

Fake vim

See merge request !19

Revert the commit because the std::function was not appy and a bad_call
was thrown when attempting to delete the unique_ptr...