remove some code duplication from syntax plugins

AUTH_ACL_CHECK event around ACL checking

dokuwiki template: Fix the preview width on small screens FS#2914

Resize image by height

* extension_manager: (71 commits)
  added plugins group to test
  show a message when search returns no results
  added missing localization
  better filename parsing
  use DOKU_LF
  remove unneeded try/catch blocks
  typo fix
  purge cache only once on install
  check for admin in AJAX backend
  now use new core funtion to recursively delete
  added status to info list of extension plugin
  added css and html changes for RTL scripts to extension manager
  added basic mobile styles to extension manager (not great, but makes things at least readable)
  fixed and improved some HTML in extension manager
  added git warning
  fixed strict standard error and added some docblock
  removed the old plugin manager
  typo fix
  protect authplain and current auth plugin
  do not show updates for bundled plugins
  ...

Conflicts:
	lib/plugins/plugin/lang/hu/admin_plugin.txt
	lib/plugins/plugin/lang/hu/lang.php

Recursive delete function 

Translation update (ru)

Translation update (hu)

Translation update (fa)

Corrections in Romanian language files

Translation update (zh)

in 82d61635 we introduced passing the
raw match for syntax plugins to the plugin method of the renderer. This
was introduced for renderer plugins that might need access to the raw
syntax (like the table editor or WYSIWYG plugins). However the function
signature was never updated, making these additional parameter basically
secret. With strict standard this throws errors. This patch fixes this.

The filename found in the URL will be used for old plugins missing a
base entry in their plugin.info.txt and lacking a subdirectory inside
the archive as well. This patch makes sure possible query strings aren't
included in the filename.

Note: io_download() will also try to get a filename from any
content-disposition header.

If no filename can be found we simply use an md5 sum of the URL and hope
the plugin will contain it's own hint for naming.

PHP_EOL is platform dependent, so you get in trouble while migrating
between platforms.

they were just catching and rethrowing

this file makes me cry. there is so much shit going on here.

This reads some duplication in the from of haveing a Doku_Parser_Mode
and Doku_Parser_Mode_Plugin class which are basically the same but only
the latter extends DokuWiki_Plugin. This avoids the performance/RAM
problems mentioned in my previous commit. An interface keeps both
logically together.

With PHP 5.4 further deduplication could be done via Traits.

This makes Doku_Parser_Mode inherit from DokuWiki_Plugin which allows
for the removal of a bunch of duplicate code form
DokuWiki_Syntax_Plugin. This makes the code easier to maintain and makes
sure all DokuWiki plugins are actual instances of DokuWiki_Plugin.

However this adds a bunch of functions to the "normal" parser modes that
don't need them which could have performance/RAM implications.

Something is broken on travis-ci.org regarding the max execution time
limit and code coverage generation. I have no clue how to solve this, so
I remove this again for test completion's sake.

Please chime in with ideas at

* https://github.com/travis-ci/travis-ci/issues/1837
* http://stackoverflow.com/q/20972248/172068

not sure if we end up using it

this is not a extension specific cache but a global one. no need to
purge for each installed extension