Extension Manager: adjust notice strings

Because notices are shown on command line as well as in the admin GUI,
we can not use HTML in them. This adjusts the affected language strings
and removes th

Extension Manager: adjust notice strings

Because notices are shown on command line as well as in the admin GUI,
we can not use HTML in them. This adjusts the affected language strings
and removes the previously used clean up routine.

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Extension Manager: check dependencies on uninstall/disable

Extensions that others depend on should not be uninstalled.

Extension Manager: adjust javascript and images

This simpliefies the view options into a single filter, which toggles
between all and updatable extensions. This should be less confusing and
is what

Extension Manager: adjust javascript and images

This simpliefies the view options into a single filter, which toggles
between all and updatable extensions. This should be less confusing and
is what most people use anyway.

Image use has been reduced and SVGs are used for icons now. Placeholders
are still PNG.

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Extension Manager: overhauled list display style

The GUI is still not fully functional again.

Extension Manager: First go at reimplementing the GUI

still a long road ahead

Extension Manager: ensure php requirements before installing

This makes use of the new minphp and maxphp fields in the info.txt

Extension Manager: CLI now should completely use new classes

Extension Manager: make installation work again

The Installer class now also handles dependencies

First start at refactoring the extension manager

The aim is to readd the existing functionality into proper classes, then
extend from there.

show update message in Extension Manager if available

More resilence when talking to plugin repo fixes #4135

When the plugin repository answers but returns non-data (as can happen
when the database isn't available, as we have learned yesterday), the
ex

More resilence when talking to plugin repo fixes #4135

When the plugin repository answers but returns non-data (as can happen
when the database isn't available, as we have learned yesterday), the
extension manager still tried to deserialize the data.

This changes all communication from php-serialized to JSON encoded data.
When JSON-decoding fails, the data is ignored and an error message is
shown. Failure data like this will not be cached.

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add overwrite option on extension upload form

By default, on frontend $overwrite is false. Backend function installFromUpload
/ installFromURL will have a default of true to preserve existing behavi

add overwrite option on extension upload form

By default, on frontend $overwrite is false. Backend function installFromUpload
/ installFromURL will have a default of true to preserve existing behavior for
other API users.

installArchive now will insert a frontend msg() about not installing because of
overwrite restriction. It's not being exposed by exception, but it should be
reflected on its return array list of installed plugin.

This fixes #715.

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Generate display options via JS

Since it is a JS function only, the form will be generated by it too.

Add display options to extension manger

Allows tho show/hide extensions that are: enabled, disabled, updatable

check for SSL support in the extension manager

Merge remote-tracking branch 'origin/master' into scrutinizerissues

Conflicts:
inc/media.php
inc/plugin.php
inc/template.php
lib/plugins/authplain/_test/escaping.test.php
lib/plugins/syntax.php

warn about enabled, but not used auth plugins

PHPDocs and some improvements

added missing translation string in extension manager

extension manager: some minor tweaks in the info screen

added missing localization

better filename parsing

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 mak

better filename parsing

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.

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added status to info list of extension plugin

added css and html changes for RTL scripts to extension manager

fixed and improved some HTML in extension manager