Fix for Laravel Breeze auth

Bug fixes

• PanicHD in a Laravel app with an auth package that uses App\Models\User gives an error in PanicHD\Member model
  • Affected PanicHD installations:
    • Laravel 8 new installations with laravel/breeze or other auth packages
    • Earlier Laravel versions not using laravel/ui
  • Patch:
    • Creation of serveral PanicHD\Member models
      • Member_AppUser that extends App\User
      • Member_AppModelsUser that extends App\Models\User
    • Creation of MemberTrait that holds all Member models functionality
    • In service provider, if Member model setting is not configured, check for App\Models\User existence
    • use App\User if previous model was not found
    • Solves #28. Thank you @wertex !
• Routes
  • PanicHD was using "dashboard" route name, which is already used and overlapped by Laravel. Renamed to "panichd.dashboard"
• Seeders
  • Demo seeder was giving an error on execution
• Search form
  • Got hang when using "attachment_name" or "any_text_field" fields
  • Using any of these fields added several attachment table joins which was making the search too much slow
  • Now attachment search for both fields is done apart and added as a ticket id array to the main ticket search query, which is faster
• Ticket List
  • Agent change modal window
    • Check to change status was not showing default status name
    • After clicking on submit button, modal window was not closing

Patches

• Documentation
  • Package requirements
    • Added MySQL off "strict mode" requirement. I did encounter this upgrading to MySQL 8, because DataTables was throwing a GROUP BY error until I changed these settings. 
  • Installation process steps reviewed and clarified
• Summernote config file
  • Check file existence before loading it
• Ticket complete / reopen action
  • Was deleting last complete / reopen comment, despite if last action was done by other member of if there was any comment between last comment and current action
  • Now it is only deleted if last comment of this kind is done by the same member and within 1 minute
• Search form
  • "attachment_name" field has been changed to "attachment_text"

New settings

• embedded_image_prefix : Name prefix for embedded images above resolution limit, which get transformed into an attachment