[Imapsync] Use dropdown for custom params

data/web/inc/vars.inc.php

@@ -285,10 +285,7 @@ $IMAPSYNC_OPTIONS = array(
   'whitelist' => array(
     'abort',
     'authmd51',
-    'authmd52',
-    'authmech2',
     'authuser1',
-    'authuser2',
     'debug',
     'debugcontent',
     'debugcrossduplicates',
@@ -296,20 +293,15 @@ $IMAPSYNC_OPTIONS = array(
     'debugfolders',
     'debugimap',
     'debugimap1',
-    'debugimap2',
     'debugmemory',
     'debugssl',
     'delete1emptyfolders',
     'delete2folders',
     'disarmreadreceipts',
     'domain1',
-    'domain2',
     'domino1',
-    'domino2',
-    'dry',
     'errorsmax',
     'exchange1',
-    'exchange2',
     'exitwhenover',
     'expunge1',
     'f1f2',
@@ -319,7 +311,6 @@ $IMAPSYNC_OPTIONS = array(
     'folderlast',
     'folderrec',
     'gmail1',
-    'gmail2',
     'idatefromheader',
     'include',
     'inet4',
@@ -329,10 +320,7 @@ $IMAPSYNC_OPTIONS = array(
     'justfoldersizes',
     'justlogin',
     'keepalive1',
-    'keepalive2',
     'log',
-    'logdir',
-    'logfile',
     'maxbytesafter',
     'maxlinelength',
     'maxmessagespersecond',
@@ -342,43 +330,24 @@ $IMAPSYNC_OPTIONS = array(
     'minsize',
     'noabletosearch',
     'noabletosearch1',
-    'noabletosearch2',
     'noexpunge1',
-    'noexpunge2',
     'nofoldersizesatend',
     'noid',
     'nolog',
     'nomixfolders',
     'noresyncflags',
     'nossl1',
-    'nossl2',
     'nosyncacls',
     'notls1',
-    'notls2',
-    'nouidexpunge2',
     'nousecache',
-    'oauthaccesstoken2',
-    'oauthdirect2',
     'office1',
-    'office2',
-    'pidfile',
-    'pidfilelocking',
     'prefix1',
-    'prefix2',
-    'proxyauth1',
-    'proxyauth2',
     'resyncflags',
     'resynclabels',
     'search',
     'search1',
-    'search2',
     'sep1',
-    'sep2',
-    'showpasswords',
     'skipemptyfolders',
-    'ssl2',
-    'sslargs1',
-    'sslargs2',
     'subfolder1',
     'subscribe',
     'subscribed',
@@ -389,7 +358,6 @@ $IMAPSYNC_OPTIONS = array(
     'tests',
     'testslive',
     'testslive6',
-    'tls2',
     'truncmess',
     'usecache',
     'useheader',