Replace strftime with Intl ICU. Fixes #3573

This uses a class that maps strftime placeholders to the appropriate ICU
patterns. I am using the fallback-intl branch here which provides an
English-only

Replace strftime with Intl ICU. Fixes #3573

This uses a class that maps strftime placeholders to the appropriate ICU
patterns. I am using the fallback-intl branch here which provides an
English-only fallback when the intl extension is not available.

Core has only two places where strftime is used: dformat() and the
SimplePie feed parser. Both are adjusted with this patch. For the latter
a custom Item class had to be registered. For better separation all our
FeedParser classes have been moved to the Feed namespace where our
FeedCreator classes already reside.

Note that this will currently be a degration for users without intl as
it will fall back to date and not to the still available strftime.

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replace LESS library. fixes #4088

This replaces the abandoned fork with my own fork at splitbrain/lesserphp

That fork has been cleaned up somewhat and the issues in #4088 should be
fixed.

upgrade to phpseclib 3

This replaces the dependabot PR #4114 and adjusts the usage of the
library.

updated composer dependencies

updates may also be caused by the php platform version increase in the last
commit

extracted JS compressor into its own library

This moves our JavaScript compressor into its own composer dependency.

updated composer dependencies

upgraded UniversalFeedCreator to v1.8.4.1

fixes #3651

move IXR XML RPC to composer dependency #1970

This is a monky patched version of kissyfrot/php-ixr until my PR has
been accepted upstream.

Plugins using the XML RPC client may need adjustments.

added Slika as dependency

replace Doku_CLI with splitbrain\phpcli\CLI

It has few more features (like turning down verbosity) and looks nicer

Use composer installed phpseclib

We used to ship only parts of phpseclib in inc/phpseclib which made it a
little tricky to update. This replaces the library with a composer
installed version, making

Use composer installed phpseclib

We used to ship only parts of phpseclib in inc/phpseclib which made it a
little tricky to update. This replaces the library with a composer
installed version, making the rest of the library available to plugin
authors. It might fix a problem with PHP 7.1 as reported in #1682
(unconfirmed)

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added composer setup and the first composer package php-archive