adjust php.net URL

https://secure.php.net is redirected to https://www.php.net by now, see PR#2371

Remove the htmlok and phpok embedding options

Both options have grave security implications and novice users seem to
ignore advice about them. In the last decades I never came across a wiki
that had

Remove the htmlok and phpok embedding options

Both options have grave security implications and novice users seem to
ignore advice about them. In the last decades I never came across a wiki
that had legitimate use of these options.

If someone needs the functionality, it can easily be added back using a
plugin. But I prefer to give users one less option to shoot themselves
in the foot.

Removal of the translations for the config strings can follow after this
has been merged.

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Revert "Merge pull request #3039 from takuy/video-attributes"

This reverts commit 408d79f78505248f9ccb44bd2561cedc250ce5a1, reversing
changes made to b7c67f83bd81eff3186e4ebd2d9e86cd2c32468d.

SVG based smileys

This patch replaces our old gif based smileys by SVG based ones from the
Twemoji project. This allows for scaling the emojis with the text
they're used in.

update wiki:syntax with usage doc

Update year 2019 to 2020

Update link to https in welcome message

Update links and copyright year in documentation

- Remove few dead links.
- Move links from HTTP to HTTPS, this should be standard.
- Update year 2015 to 2019.

Update composer dependencies

The following dependencies have been updated:

splitbrain/php-archive (1.0.10 => 1.1.1)
phpseclib/phpseclib (2.0.11 => 2.0.23)
paragonie/random_compat (v2.0.12 => v2.0.1

Update composer dependencies

The following dependencies have been updated:

splitbrain/php-archive (1.0.10 => 1.1.1)
phpseclib/phpseclib (2.0.11 => 2.0.23)
paragonie/random_compat (v2.0.12 => v2.0.18)
simplepie/simplepie (1.5.1 => 1.5.3)
geshi/geshi (v1.0.9.0 => v1.0.9.1)
openpsa/universalfeedcreator (v1.8.3 => v1.8.3.2):
marcusschwarz/lesserphp
splitbrain/php-cli (1.1.2 => 1.1.5)

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