rails up to 7.0and ruby to 2.7.2

mv lib to app/lib due to upgrade

removing concerns from autoload path

resolve zeitwerk issues

make foodsoft run for dev on rails 7 and ruby 2.7

fix mail file permission bug

fix database_config

fix articles controller test ActiveModell::Error

bump Gemfile.lock

app/lib/foodsoft_file.rb

@@ -0,0 +1,25 @@
+# Foodsoft-file import
+class FoodsoftFile
+  # parses a string from a foodsoft-file
+  # returns two arrays with articles and outlisted_articles
+  # the parsed article is a simple hash
+  def self.parse(file, options = {})
+    SpreadsheetFile.parse file, options do |row, row_index|
+      next if row[2].blank?
+
+      article = { :order_number => row[1],
+                  :name => row[2],
+                  :note => row[3],
+                  :manufacturer => row[4],
+                  :origin => row[5],
+                  :unit => row[6],
+                  :price => row[7],
+                  :tax => row[8],
+                  :deposit => (row[9].nil? ? "0" : row[9]),
+                  :unit_quantity => row[10],
+                  :article_category => row[13] }
+      status = row[0] && row[0].strip.downcase == 'x' ? :outlisted : nil
+      yield status, article, row_index
+    end
+  end
+end