feat: plugin scaffolding

includes/class-base-settings.php

includes/class-field.php

includes/class-integration.php

includes/class-menu.php

includes/class-plugin.php

includes/class-settings.php

includes/class-singleton.php

includes/fields/class-field.php

includes/fields/gf/iban/class-field-adapter.php

includes/fields/gf/iban/class-field.php

includes/fields/gf/iban/class-gf-field.php

includes/fields/wpcf7/iban/class-field.php

includes/fieldset-control-js.php

includes/integrations/gf/class-integration.php

includes/integrations/wpcf7/class-integration.php

languages/wpct-erp-forms-ca.mo

languages/wpct-erp-forms-ca.po

languages/wpct-erp-forms-en_US.mo

languages/wpct-erp-forms-en_US.po

languages/wpct-erp-forms-es_ES.mo