GeezerVison

The OnUpdatePhpDebugger* wrapper handlers used entry->modified to
decide whether to apply a value. During zend_register_ini_entries()
(MINIT stage), PHP always sets entry->modified=0 for newly registered
entries, even when the user explicitly set the value via -d or php.ini.
This caused all php_debugger.* settings to be silently ignored.

Replace the entry->modified check with a helper that also consults
zend_get_configuration_directive(), which correctly returns non-NULL
when the value was explicitly set.

Fixes #31

When php_debugger.* and xdebug.* are both set, php_debugger.* must
take precedence. The wrapper handlers already wrote to the correct
struct field, but ini_get("xdebug.foo") still returned the xdebug.*
value because each INI entry maintains its own value string.

Add php_debugger_sync_canonical() which directly updates the canonical
xdebug.* entry value string after a successful php_debugger.* update.
Uses zend_hash_find_ptr on EG(ini_directives) to avoid re-triggering
the canonical handler.

Three new tests verify precedence:
- ini_alias_precedence: php_debugger.* before xdebug.* in -d order
- ini_alias_precedence_reverse: xdebug.* before php_debugger.*
- ini_alias_precedence_ini_get: ini_get() reflects php_debugger.* values
  for both xdebug.* and php_debugger.* names (mixed INI order)

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