Switched to CMakeLists.txt per directory but most detecting is still done in

global one. Includes and libraries are properly propagated using
PUBLIC/INTERFACE so we do not have to repeat dependencies.

src/pgsql/CMakeLists.txt

@@ -0,0 +1,22 @@
+
+add_library(pgsql STATIC
+    Pgsql_Connection.cpp
+    Pgsql_Params.cpp
+    Pgsql_Result.cpp
+    Pgsql_Row.cpp
+    Pgsql_Value.cpp)
+
+target_link_libraries(pgsql PUBLIC
+    postgresql
+    Qt5::Core
+    )
+    
+target_include_directories(pgsql INTERFACE
+    $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>
+)
+    
+set_target_properties(pgsql PROPERTIES 
+    CXX_STANDARD 14
+    CXX_STANDARD_REQUIRED ON
+    POSITION_INDEPENDENT_CODE True
+    )