Implement event model in C++

Filtering events in JS is too slow with >20,000 events. This moves the
event data model into C++.

fuzbal.pro

@@ -1,11 +1,15 @@
 # SPDX-License-Identifier: Unlicense
 
 QT += multimedia qml quick quickcontrols2 svg widgets
-CONFIG += embed_translations lrelease
+CONFIG += c++1z embed_translations lrelease qmltypes
 DEFINES += GIT_VERSION=\\\"$$system(git -C "$$_PRO_FILE_PWD_" describe --always --tags)\\\"
 
-SOURCES += main.cpp
-HEADERS += io.h
+QML_IMPORT_NAME = fuzbal
+QML_IMPORT_MAJOR_VERSION = 1
+
+SOURCES += event_list.cpp main.cpp
+HEADERS += event_list.h io.h
+
 RESOURCES += main.qrc icons.qrc
 TRANSLATIONS += translations/fuzbal_sl.ts