Switch to cmake + vcpkg, builds on linux, windows needs verification.

Code has been modified to be portable.

pgsql/CMakeLists.txt

@@ -0,0 +1,48 @@
+find_package(PostgreSQL REQUIRED)
+
+add_library(pgsql STATIC
+    Pgsql_Connection.cpp
+    Pgsql_Params.cpp
+    Pgsql_PgException.cpp
+    Pgsql_Result.cpp
+    Pgsql_Row.cpp
+    Pgsql_Value.cpp
+    ArrayParser.cpp
+    Pgsql_oids.cpp
+    Pgsql_Transaction.cpp
+    Pgsql_ErrorDetails.cpp
+    Pgsql_Canceller.cpp
+    Pgsql_Connection.h
+    Pgsql_IResult.h
+    Pgsql_Params.h
+    Pgsql_PgException.h
+    Pgsql_Result.h
+    Pgsql_ResultConstIterator.h
+    Pgsql_Row.h
+    Pgsql_Value.h
+    Pgsql_declare.h
+    Pgsql_Col.h
+    ArrayParser.h
+    Pgsql_oids.h
+    SqlGenerator.h
+    Pgsql_Transaction.h
+    Pgsql_ErrorDetails.h
+    Pgsql_Canceller.h
+    )
+
+target_link_libraries(pgsql PUBLIC
+    core
+    PostgreSQL::PostgreSQL
+    Qt6::Core
+    Qt6::Widgets
+    )
+
+target_include_directories(pgsql PUBLIC
+    $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>
+    )
+
+set_target_properties(pgsql PROPERTIES
+    CXX_STANDARD 20
+    CXX_STANDARD_REQUIRED ON
+    POSITION_INDEPENDENT_CODE ON
+    )