[Build] Extend PCH to libraries and grow IWYU-driven header sets (#7456)

The executables precompile Qt since #7235, but the libcockatrice_*
static libraries still reparse the full Qt Core stack in every TU.
Measured over the tree after the IWYU pass: 380 MB of header parse in
the libraries, 92% of it reachable from qtcore_pch.h.

- Apply qtcore_pch.h to the 14 Qt Core static library targets
  (skips libcockatrice_rng: its SFMT.c is C and cannot use a C++
  precompiled header).
- Grow qtcore_pch.h with 25 QtCore headers that IWYU shows are
  re-parsed across many TUs and were not already reachable from the
  existing list (JSON/QUuid cluster, QSettings, item models,
  threading, XmlStream, QTemporaryDir, ...).
- Grow qtwidgets_pch.h with 30 QtGui/QtWidgets headers (dialog
  cluster, item views, QImageReader, ...).

Only stable Qt headers go into the PCH, so it rarely invalidates.
Test executables stay PCH-less: 1-3 TUs per target does not amortize
the extra precompile.

Co-authored-by: Lukas Brübach <Bruebach.Lukas@bdosecurity.de>

cmake/pch/qtcore_pch.h

@@ -3,22 +3,53 @@
  *
  * Safe for every target that links Qt Core, including the headless
  * Servatrice binary. Keep this header free of any widget/gui types.
+ *
+ * Candidates are chosen from IWYU include statistics: a header earns a
+ * spot when it is not already reachable from the rest of this list and
+ * enough translation units re-parse it. Qt headers are stable across
+ * builds, so the precompiled header rarely invalidates.
  */
 
 #include <QBasicTimer>
 #include <QByteArray>
+#include <QCommandLineParser>
+#include <QCoreApplication>
+#include <QCryptographicHash>
 #include <QDateTime>
 #include <QDebug>
+#include <QDir>
+#include <QElapsedTimer>
 #include <QFile>
+#include <QFileInfo>
 #include <QHash>
+#include <QItemSelectionModel>
+#include <QJsonArray>
+#include <QJsonDocument>
+#include <QJsonObject>
+#include <QJsonValue>
 #include <QList>
 #include <QLoggingCategory>
 #include <QMap>
+#include <QMetaEnum>
 #include <QMetaObject>
+#include <QMutex>
+#include <QMutexLocker>
 #include <QObject>
+#include <QPointer>
+#include <QPropertyAnimation>
 #include <QRandomGenerator>
+#include <QReadWriteLock>
+#include <QRegularExpression>
+#include <QSet>
+#include <QSettings>
 #include <QSharedPointer>
+#include <QSortFilterProxyModel>
 #include <QString>
 #include <QStringList>
+#include <QTemporaryDir>
+#include <QThread>
 #include <QTimer>
+#include <QUuid>
 #include <QVariant>
+#include <QXmlStreamReader>
+#include <QXmlStreamWriter>

cmake/pch/qtwidgets_pch.h

@@ -4,27 +4,56 @@
  * Includes the Qt Core precompiled header plus the heavy Gui, Widgets and
  * Network layers that virtually every client translation unit re-parses.
  * Do not use on Servatrice (headless, QT_DONT_USE_QTGUI).
+ *
+ * Candidates are chosen from IWYU include statistics: a header earns a
+ * spot when it is not already reachable from the rest of this list and
+ * enough translation units re-parse it. Qt headers are stable across
+ * builds, so the precompiled header rarely invalidates.
  */
 
 #include "qtcore_pch.h"
 
 #include <QAction>
 #include <QApplication>
+#include <QCheckBox>
+#include <QComboBox>
+#include <QCompleter>
+#include <QDialogButtonBox>
+#include <QDockWidget>
+#include <QFileDialog>
+#include <QFormLayout>
 #include <QFrame>
 #include <QGraphicsItem>
 #include <QGraphicsScene>
+#include <QGraphicsSceneMouseEvent>
 #include <QGraphicsView>
+#include <QGridLayout>
+#include <QGroupBox>
+#include <QHBoxLayout>
+#include <QHeaderView>
 #include <QImage>
+#include <QImageReader>
+#include <QInputDialog>
 #include <QLabel>
 #include <QLayout>
+#include <QListWidget>
 #include <QMainWindow>
 #include <QMenu>
+#include <QMessageBox>
 #include <QNetworkAccessManager>
 #include <QNetworkReply>
 #include <QPainter>
+#include <QPlainTextEdit>
 #include <QPushButton>
 #include <QScrollArea>
+#include <QSpinBox>
+#include <QSplitter>
+#include <QStandardItemModel>
 #include <QTabWidget>
+#include <QTableWidget>
+#include <QTableWidgetItem>
 #include <QToolBar>
+#include <QToolButton>
 #include <QTreeWidget>
+#include <QVBoxLayout>
 #include <QWidget>