Rubocop: Fix all current warnings and enable further areas (#1489)

* Add devcontainer

* Fix rubocop warning

* Fix trailing whitespace

* Fix redundant returns

* Fix redundant returns

* Style/RedundantRegexpEscape: Redundant escape inside regexp literal

* Various rubocop tweaks

* Rubocop: Use pipes, not ternary

* Rubocop: Spacing

* Rubocop: Spacing

* More rubocop tweaks

* Rubocop

* Generate a lot of TODOs

* Clean up false positives

* Grandfather in old naming style

* Rubocop

* Permit legacy

* Rename

* Fix all current warnings

* Rubocop

Author: CloCkWeRX

.rubocop.yml

@@ -1,7 +1,15 @@
 inherit_from: .rubocop_todo.yml
 
+plugins:
+  - rubocop-capybara
+  - rubocop-factory_bot
+  - rubocop-rails
+  - rubocop-rspec
+  - rubocop-rspec_rails
+
 AllCops:
-  TargetRubyVersion: 3.3
+  TargetRubyVersion: 3.4
+  NewCops: enable
 
 Bundler/OrderedGems:
   Enabled: false
@@ -71,3 +79,29 @@ Style/WordArray:
 
 Style/SymbolArray:
   EnforcedStyle: percent
+
+RSpec/DescribeClass:
+  Exclude:
+    - 'spec/views/**/*_spec.rb'
+    - 'spec/lib/errors_spec.rb'
+
+# Arguably these should be fixed at a later point, but would require depreciation, aliases, etc.
+Naming/PredicatePrefix:
+  Exclude:
+    - 'spec/support/assert_select.rb'
+    - 'app/inputs/date_time_input.rb'
+    - 'app/models/users/user.rb'
+    - 'lib/fat_free_crm/fields.rb'
+    - 'lib/fat_free_crm/mail_processor/base.rb'
+
+RSpec/SpecFilePathFormat:
+  Exclude:
+    - 'spec/routing/**/*.rb'
+    - 'spec/lib/**/*.rb'
+
+Rails/CreateTableWithTimestamps:
+  Exclude:
+    - 'db/migrate/20100928030600_create_openid_tables.rb'
+    - 'db/migrate/20100928030617_drop_openid_tables.rb'
+    - 'db/migrate/20230526211831_create_active_storage_tables.active_storage.rb'
+    - 'db/migrate/20100928030627_acts_as_taggable_on_migration.rb'