Simplify QFileSystemModel::remove by using QDir::removeRecursively

This also fixes it in case of hidden or system files, which
were missing from the filter (found by Denis Kovalskiy).

Change-Id: Ic12de12ec51c20de52d040514e90be5e783add43
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
WinRT: Disable PCRE JIT

That is what we do on on other "limited" platforms.

Change-Id: I608880698d60ab10ecbb2f3ce12ff6c5eaab7eed
Reviewed-by: Maurice Kalinowski <maurice.kalinowski@digia.com>
Reviewed-by: Andrew Knight <andrew.knight@digia.com>
Reviewed-by: Oliver Wolff <oliver.wolff@digia.com>