Draft: Fix mpv deadlock on quit main window

Solves #5

src/Lib/Script/CRTPLuaScriptObject/FreeFunctions.cc

-#include "PreCompiledHeaders.hh"
-#include "Lib/Script/CRTPLuaScriptObject.hh"
-#include "Lib/Script/LuaContext.hh"
-#include "Lib/Document/CRTPSubDocument.hh"
-#include "Lib/Document/VivyDocument.hh"
-#include "Lib/Audio.hh"
-#include "Lib/Video.hh"
-#include "VivyApplication.hh"
-
-using namespace Vivy::Script;
-
-FreeFunctions::FreeFunctions(lua_State *const L) noexcept
-{
-    const auto *const context = LuaContext::getContext(L);
-    out(context) << "Creating the FreeFunctions lua object!";
-
-    std::shared_ptr<VivyDocument> vivyDoc = context->getAttachedVivyDocument();
-    if (vivyDoc) {
-        if (!(vivyDoc->checkDocumentCapabilities(VivyDocument::AudioAble) &&
-              vivyDoc->checkDocumentCapabilities(VivyDocument::AssAble) &&
-              vivyDoc->checkDocumentCapabilities(VivyDocument::AudioAble))) {
-            err(context) << "The VivyDocument is not a complete document, "
-                         << "can't load it for scripting";
-            luaGlobalError(L, "Attached VivyDocument is not complete");
-        }
-
-        out(context) << "Initializing the FreeFunctions lua object with the VivyDocument";
-        std::shared_ptr<VideoStream> video = vivyDoc->getVideoSubDocument()->getDefaultStream();
-        [[maybe_unused]] std::shared_ptr<AudioStream> audio =
-            vivyDoc->getAudioSubDocument()->getDefaultStream();
-
-        videoWidth  = video->getWidth();
-        videoHeight = video->getWidth();
-        TODO(Set getters values for audio)
-    }
-
-    else {
-        out(context) << "No attached Vivy document in the Lua context";
-    }
-}
-
-int
-FreeFunctions::print(lua_State *const L) noexcept
-{
-    const std::string_view arg = CHECK_STRING_VIEW(L, 1);
-    out(LuaContext::getContext(L)) << "OUT: " << arg;
-    LUA_RETURN_NOTHING(L);
-}
-
-int
-FreeFunctions::getModule(lua_State *const L) noexcept
-{
-    const auto *const context                           = LuaContext::getContext(L);
-    const std::string_view modName                      = CHECK_STRING_VIEW(L, 1);
-    [[maybe_unused]] const ModuleDeclaration *const mod = context->getModule(modName);
-    return 1;
-}