Turn things in common into separate libs.

Took 2 hours 27 minutes

libs/rng/CMakeLists.txt

@@ -0,0 +1,27 @@
+set(CMAKE_AUTOMOC ON)
+set(CMAKE_AUTOUIC ON)
+set(CMAKE_AUTORCC ON)
+
+set(HEADERS
+    include/rng/rng_abstract.h
+    include/rng/rng_sfmt.h
+    include/rng/sfmt/SFMT.h
+)
+
+if (Qt6_FOUND)
+    qt6_wrap_cpp(MOC_SOURCES ${HEADERS})
+elseif (Qt5_FOUND)
+    qt5_wrap_cpp(MOC_SOURCES ${HEADERS})
+endif ()
+
+add_library(cockatrice_rng STATIC
+    src/rng_abstract.cpp
+    src/rng_sfmt.cpp
+    src/sfmt/SFMT.c
+    ${MOC_SOURCES}
+)
+
+target_include_directories(cockatrice_rng
+    PUBLIC include
+    PUBLIC include/sfmt
+)