[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>

libcockatrice_models/libcockatrice/models/database/CMakeLists.txt

@@ -29,3 +29,5 @@ add_library(
 target_include_directories(libcockatrice_models_database PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
 
 target_link_libraries(libcockatrice_models_database PUBLIC libcockatrice_card libcockatrice_filters ${QT_CORE_MODULE})
+
+target_precompile_headers(libcockatrice_models_database PRIVATE "${CMAKE_SOURCE_DIR}/cmake/pch/qtcore_pch.h")

libcockatrice_models/libcockatrice/models/deck_list/CMakeLists.txt

@@ -16,3 +16,5 @@ target_include_directories(libcockatrice_models_deck_list PUBLIC ${CMAKE_CURRENT
 target_link_libraries(
   libcockatrice_models_deck_list PUBLIC libcockatrice_card libcockatrice_deck_list ${QT_CORE_MODULE}
 )
+
+target_precompile_headers(libcockatrice_models_deck_list PRIVATE "${CMAKE_SOURCE_DIR}/cmake/pch/qtcore_pch.h")