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/core/CMakeLists.txt

@@ -0,0 +1,23 @@
+set(CMAKE_AUTOMOC ON)
+
+add_library(core STATIC
+    BackupFormatModel.cpp
+    CsvWriter.cpp
+    my_boost_assert_handler.cpp
+    PasswordManager.cpp
+    SqlLexer.cpp)
+    
+target_link_libraries(core PUBLIC
+    botan
+    Qt5::Core
+    )
+    
+target_include_directories(core INTERFACE
+    $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>
+)
+
+set_target_properties(core PROPERTIES 
+    CXX_STANDARD 14
+    CXX_STANDARD_REQUIRED ON
+    POSITION_INDEPENDENT_CODE True
+    )