[WIP] Only show SSL table header if there are certificates

Fix failing tests related to timezones on master

Fix occ user:add failure return codes

Add mount point to disable the encryption wrapper

Add OC_Response::setContentLengthHeader() for Apache PHP SAPI workaround...

fix caching of preferred language

Introducing media types for yml, yaml, cnf, conf

Update exception messages to better reflect and describe the problem

Make findBinaryPath compatible with open_basedir

Added part files for when writing chunks

fixing #15344

setup storage wrappers before setting up the filesystem

Fix the initial list of groups

Split image provider in one sub-class per media type