Log Message:
Update contao35 to 3.5.8.

Version 3.5.8 (2016-03-01)
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### Fixed
Re-add the `$blnFixDomain` argument to keep backwards compatibility.

Version 3.5.7 (2016-02-29)
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### Fixed
Always fix the domain and language when generating URLs (see #8238).

### Fixed
Fix two issues with the flexible back end theme (see #8227).

### New
Added new versioning hooks (see #8168).

 * "oncreate_version_callback" (supersedes "onversion_callback")
 * "onrestore_version_callback" (supersedes "onrestore_callback")

### Fixed
Correctly toggle custom page type icons (see #8236).

### Fixed
Fix the domain in all article, news, event and FAQ insert tags (see #8204).

### Fixed
Update mediaelement.js to version 2.19.0.1 (see #8217).

### Fixed
Correctly render the links in the monthly/yearly event list menu (see #8140).

### Fixed
Skip the registration related fields if a user is duplicated (see #8185).

### Fixed
Correctly show the form field type help text (see #8200).

### Fixed
Correctly create the initial version of a record (see #8141).

### Fixed
Correctly show the "expand preview" buttons (see #8146).

### Fixed
Correctly check that a password does not match the username (see #8209).

### Fixed
Check if a directory exists before executing `mkdir()` (see #8150).

### Fixed
Do not link to the maintenance module if the user cannot access it (see #8151).

### Fixed
Show the "new folder" button in the template manager (see #8138).