ui: add browser settings window

mostly copied from pve (for now; will refactor when i add it to
pmg too (soon)) without the pve specific features like dashboard
storages

contains some eslint fixes comparing to pves window

Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>

www/Makefile

@@ -70,6 +70,7 @@ JSSRC=							\
 	window/SyncJobEdit.js				\
 	window/UserEdit.js				\
 	window/UserPassword.js				\
+	window/Settings.js				\
 	window/TokenEdit.js				\
 	window/TfaEdit.js				\
 	window/VerifyJobEdit.js				\