Use hooks instead of stack trace inspection

[PVince81]

Instead of inspecting the stack trace in

terms_of_service/lib/Filesystem/Helper.php

Line 66 in 36f2a48

$trace = $exception->getTrace();

, introduce (cancellable?) hooks in relevant classes in server.

The hooks could be called something like "beforeCopySkeleton" and "afterCopySkeleton"

• LoginController
• ClientFlowLoginController
• ClientFlowLoginV2Controller
• RegisterController

[nickvergessen]

But this is not only about the skeleton. it's also when doing the skeleton.
But also e.g. when talk tries to create the Talk folder on login, etc (exactly the problem that led to #496 )

[PVince81]

ah yes, so probably will need to rename the function also.
it's about the various login flows