Replace GIF flag scan with static ISO alpha-3 country list and SVG flags

- Add countries_inc.php: 252 countries as alpha-3 → name + alpha-3 → alpha-2
  map for flag image lookup; derived from webtrees CountryService, no runtime
  webtrees dependency
- Add 243 Marble SVG flags (xx.svg) plus eng/sct/wls/nir for constituent countries
- Remove 244 full-name GIF flags
- RoleUser: set users_country_code (alpha-3), flag (alpha-2 lowercase), and
  users_country (display name) at load time
- preferences.php, register.php, hauth_register.php: replace opendir GIF scan
  with require_once countries_inc.php
- Templates: replace {section loop=$flags} with {foreach $countries as $code => $name};
  iexplain now uses display name instead of raw flag code

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

1 files changed, 4 insertions, 13 deletions

diff --git a/register.php b/register.php
index d9220eb..e75948c 100755
--- a/register.php
+++ b/register.php
@@ -112,7 +112,7 @@ if( isset( $_REQUEST["register"] ) ) {
 } else {
 	if( $gBitSystem->isFeatureActive( 'custom_user_fields' ) ) {
 		$fields= explode( ',', $gBitSystem->getConfig( 'custom_user_fields' )  );
-		trim_array( $fields );
+		KernelTools::trim_array( $fields );
 		$gBitSmarty->assign('customFields', $fields);
 	}
 
@@ -134,18 +134,9 @@ $languages = $gBitLanguage->listLanguages();
 $gBitSmarty->assign( 'languages', $languages );
 $gBitSmarty->assign( 'gBitLanguage', $gBitLanguage );
 
-// Get flags here
-$flags = [];
-$h = opendir( USERS_PKG_PATH.'icons/flags/' );
-while( $file = readdir( $h )) {
-	if( strstr( $file, ".gif" )) {
-		$parts = explode( '.', $file );
-		$flags[] = $parts[0];
-	}
-}
-closedir( $h );
-sort( $flags );
-$gBitSmarty->assign('flags', $flags);
+require_once( USERS_PKG_INCLUDE_PATH.'countries_inc.php' );
+asort( $bwCountries );
+$gBitSmarty->assign( 'countries', $bwCountries );
 
 $listHash = [
 	'is_public' => 'y',