Force Custom User Field Completion after Registration or Login v2.0.1

Tested with XF 2.3.6

• FIX: Skip validation if not in a public app context (e.g., CLI or job rebuilds)
• FIX: Ensure all validation is user-centric

Tested with XF 2.3.4

• FIX: Add phrase for missing field title: user_field_title.about_you
• FIX: verifyAvatarCropX() for XF < 2.2.x
• ADD: Add session exclusion logic for efficiency
• ADD: XF:Index, but exclude instanceof isAdmin()
• ADD: Build.json to exclude unnecessary files from release package
• REMOVE: Unnecessary html comments from test build

** XF 2.3 Compliant - Forwards/Backwards Compatible **

XF 2.3

• Resolved issues with XF 2.3 (redirections and fails)
• Resolved issue with admins being forced from admin.php
• Extended _preSave on UserProfile and integrated with verify fields system where possible
  • System now prompts with overlay similar to default fields for most fields
• Attempts to clear fields that are required fail
• Avatar required will still require additional page load (no change)

XF 2.0+

• Moved "wait after X days" to the top
• Cleaned up the options language for brevity
• Date of Birth Removed [select here instead: admin.php?options/groups/usersAndRegistration/]
  • may re-add at a later date
• Added current icon
• Updated <requirements> for installs to XF 2.0 - XF 2.3.x

• php 8.x deprecation fix (added null coalescing)
• resolve E_WARNING

• Updated to session.remove() to save a round trip after the user updates required fields
• Allows the user to immediately leave account update page after completing all required fields
• Removed a deprecated/unused function

• Removed custom and in-line CSS
• Used built-in XF blockMessage styling to ensure this add-on works well with all custom themes (dark or light)

• New option to "wait X days after registration" before requiring profile fields be completed

Apologies for the multiple updates, this fixes:

• Avatar only selection not being captured and forced (when it's the only selection)

• Bug fix for the edge case that no custom user fields are enforced and instead, only default XF fields are selected to be forced

• Added support to force users to upload an avatar
• Added broader support for pages that redirect to force fields

Thanks to @delicatebobster for the request to add Avatar.