refactor: handle default options w/ other optgroups

refactor: rename parameters to be less ambiguous

refactor: use existing and simpler method

refactor: Rename method to better convey its purpose

fix: remove multi-select handling -> make PR later

We currently throw an exception with setting the multiple-attribute is
attempted. If we want to implement this functionality, it might be more
sens

fix: remove multi-select handling -> make PR later

We currently throw an exception with setting the multiple-attribute is
attempted. If we want to implement this functionality, it might be more
sensible to make an extra commit for that.

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fix: Make this Form method chainable as it should be

allow selecting the preferred CDN and add event

We now have two CDNs available. code.jquery.com which is the more
popular one and CDNjs which is the faster one. Plugin authors can use a
plugin hook

allow selecting the preferred CDN and add event

We now have two CDNs available. code.jquery.com which is the more
popular one and CDNjs which is the faster one. Plugin authors can use a
plugin hook to easily implement their own preferred CDN. Authors might
even use this event to conditionally load additional JavaScript files.

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fix: ensure that there is only 1 selected option

Multiple selected option would not be valid HTML.

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Add support for optgroup-tags for select-fields

In more complex selects we may want to group options by some criteria.
HTML has the <optgroup>-tag for that purpose.

However in Order to not duplicat

Add support for optgroup-tags for select-fields

In more complex selects we may want to group options by some criteria.
HTML has the <optgroup>-tag for that purpose.

However in Order to not duplicate code, I've to move the handling of
options to the OptGroup-Class completely.

Known Issues:
-------------
* We may have more than one option with the same value and therefore
more than one option may be marked as selected.

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Remove type-attr from <select> b/c it's invalid

fixes #1776

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do not static cache useheading during tests

This took me way to long to figure out. The useheading setting was
cached in a static variable which is fine usually as it doesn't change
during a single

do not static cache useheading during tests

This took me way to long to figure out. The useheading setting was
cached in a static variable which is fine usually as it doesn't change
during a single request. But in testing we want to change it often.

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fix problems with header that look falsy. fixes #1770

load jquery via https always

split off jquery from other JS and add CDN option #1766

jQuery (and UI and Migrate) are now loaded separately from the rest of
the JavaScript. This adds at least one HTTP request more but has some
a

split off jquery from other JS and add CDN option #1766

jQuery (and UI and Migrate) are now loaded separately from the rest of
the JavaScript. This adds at least one HTTP request more but has some
advantages:

* browsers can cache it independently
* the cache is only invalidated when versions update
* we do not apply any transformations (replacements, minimizing, etc) on
this code anymore which makes our dispatcher faster for the other JS
* browsers seem to load (not execut) both (jquery and other) parallel,
which might increase download speed a bit

This split allowed for the introduction of a new config: jquerycdn. When
enabled the 3 jquery files are loaded from jQueries CDN. This adds
another two HTTP requests but:

* since it's another host those files do not apply to the 4 request per
host limit and can be loaded (not executed) in paralell which might
increase download speeds a bit
* the CDN is distributed worldwide which means files are requested from
the closest location, increasing the download speeds
* since these files/CDN are very popular, chances are high that people
already have them cached in their browsers, reducing the download time
to 0 and effectiely halving the javascript needed to download

The option currently defaults to 'off', but I would argue 'on' would be
the better default.

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jQuery Updates

- jQuery to 3.1.1
- jQuery UI to 1.12.1
- jQuery Migrate to 3.0.0

There are a few warnigs from migrate that have to be fixed. The toggles
in the Media Manager are also missing their

jQuery Updates

- jQuery to 3.1.1
- jQuery UI to 1.12.1
- jQuery Migrate to 3.0.0

There are a few warnigs from migrate that have to be fixed. The toggles
in the Media Manager are also missing their proper icons.

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Use cryptographically secure pseudo random number generator (CSPRNG)

Uses paragonie/random_compat instead of insecure home-brewed code.

It's NEVER fine to fall back to mt_rand() for secure random.

Use cryptographically secure pseudo random number generator (CSPRNG)

Uses paragonie/random_compat instead of insecure home-brewed code.

It's NEVER fine to fall back to mt_rand() for secure random.

Fixes #1760.

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