added our own file extension .part will not work here if we use file_get_contents so we used our own extension '.etmp'

prevent files_versions from calling file proxy which calls files_encryption and do unnecessary load and file operations

fixed problems with file_get_contents and file_put_contents this problem was related to text editor with big text files

Conflicts:
	apps/files_encryption/hooks/hooks.php

fix wrong signature delimiter - fix #3523

remove unused varaibles

Only update metadata that has changed

Cache mimetype icons

for external storages we never reach the path 'files', instead we need to leave the loop if no further parent exists

check list of users with access to the file from the bottom to the top. This way we avoid calling getFileInfo() on every dir, which creates a lot of overhead, especially for external storages

Conflicts:
	apps/files_encryption/hooks/hooks.php
	apps/files_encryption/lib/proxy.php
	apps/files_encryption/lib/session.php
	apps/files_encryption/lib/stream.php

Abstract session access away in a class