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_date_util.rb

@@ -0,0 +1,33 @@
+module FoodsoftDateUtil
+  # find next occurence given a recurring ical string and time
+  def self.next_occurrence(start = Time.now, from = start, options = {})
+    occ = nil
+    if options && options[:recurr]
+      schedule = IceCube::Schedule.new(start)
+      schedule.add_recurrence_rule rule_from(options[:recurr])
+      # @todo handle ical parse errors
+      occ = begin
+        schedule.next_occurrence(from).to_time
+      rescue
+        nil
+      end
+    end
+    if options && options[:time] && occ
+      occ = occ.beginning_of_day.advance(seconds: Time.parse(options[:time]).seconds_since_midnight)
+    end
+    occ
+  end
+
+  # @param p [String, Symbol, Hash, IceCube::Rule] What to return a rule from.
+  # @return [IceCube::Rule] Recurring rule
+  def self.rule_from(p)
+    case p
+    when String
+      IceCube::Rule.from_ical(p)
+    when Hash
+      IceCube::Rule.from_hash(p)
+    else
+      p
+    end
+  end
+end