Add support mimetype for extension .sh, .bash and .sh-lib

This reverts commit 2d75914f, reversing
changes made to 760fa9ea.

Using this method will result in an unneccesary extra SQL query (which also may
return an incorrect result because the underlying table changed in the
meantime).

In general:

If you are performing an UPDATE, DELETE or equivalent query,
OC_DB_StatementWrapper::execute() will already give you the number of
"affected rows" via \Doctrine\DBAL\Driver\Statement::rowCount(). This will
not work for SELECT queries, however.

If you want to know whether a table contains any rows matching your condition,
use "SELECT id FROM ... WHERE ... LIMIT 1".

If you want to know whether a table contains any rows matching your condition
and you also need the data, use "SELECT ... FROM ... WHERE ...", then use
one of the fetch() methods.

If you want to count the number of rows matching your condition, use use
"SELECT COUNT(...) AS number_of_rows FROM ... WHERE ...", then use one of the
fetch() methods.

On SQLite the app order can be arbitrary and cause strange bugs.
On MySQL, the app order seems to be always alphabetical.

This fix enforces alphabetical order to make sure that all environments
behave the same and to reduce bugs related to app loading order.

Fixes #6442

After each test suite, detects whether there are stray datafiles, hooks
or proxies, then show a warning and clear them.

This is mostly to fix acceptance tests that have a .cc file.

Also fixed typo in python mime type.

Add support for specifying the precision and scale of a decimal data
type to the XML description language.

See owncloud/core#6475

This is possible because it is possible to only use xcache as an opcode cache
but not a variable cache.

In some specific situations, the L10N bundle isn't loadable yet (for
example when there is an issue with the app_config table). In such case,
we still want to be able to log the real exception.

This fixes errors that say "OC_L10N_String::__toString must not throw
exceptions"

- L10N now converted to string to make them work with json_encode
- Added specific error message when server doesn't allow fopen on URLs
- Fixed client side to correctly show error message in a notification
- Added OCP\JSON::encode() method to encode JSON with support for the
  OC_L10N_String values

The file on disk is encrypted, and not readable on client systems

This is to make sure that method isn't broken

Fixed touch after chunk assembling which was using the wrong path,
resulting in the creation of an extra file.

Fixes #6007

make 5.3.8 the minimum supported version. This fixes several issues with broken PHP versions like: https://github.com/owncloud/core/issues/5734
Also make the version compare clearer. It was pure luck that floatval on a php version returned the correct value.