remove duplicate plugin code for syntax plugins

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 m

remove duplicate plugin code for syntax plugins

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.

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typo fix

purge cache only once on install

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

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

use config for firguring out if an extension is protected

even more fixes for the bundled extension list

template:default is no longer bundled

the plugin is called testing not test

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