Excel stuff removed.

src/core/CMakeLists.txt

@@ -9,14 +9,6 @@ find_package(Threads REQUIRED)
 
 find_package(fmt)
 
-
-if (MINGW)
-  find_package(XLNT REQUIRED STATIC)
-else (MINGW)
-  find_package(PkgConfig REQUIRED)
-  pkg_check_modules(XLNT REQUIRED xlnt>=1.3)
-endif (MINGW)
-
 set(CORE_SOURCES
     database.cpp
     entity.cpp
@@ -26,7 +18,6 @@ set(CORE_SOURCES
     article.cpp
     sale.cpp
     marketplace.cpp
-    excelreader.cpp
     csvreader.cpp
     jsonutil.cpp
     utils.cpp