docs(actions): Migrated actions section from old Getting Started docs and cleaned up related sections.

Refs #6812.
docs(events): Updated event list and cleaned up existing event docs.

Refs #6812.
docs(hook): Updated hooks docs.

Refs #6812
docs(all): Added getting started for developers.

Refs #6812
docs(all): Cleanup docs.

Refs #6812.
docs(admin): Migrated Getting Started guide from wiki.

Refs #6812.
docs(faqs): Started migrating some FAQs.
fix(bookmarks): fixes more link in group bookmarks widget

Fixes #6583
chore(tests): fixes unit test failure to create user

A test was using an old function to create the user salt and the function
output more bytes than the salt field could hold. Here we replace it with
the correct function.

Fixes #7303
Merge pull request #7305 from mrclay/7303_units_19

fix(tests): fixes unit test failure to create user
fix(i18n): translate notification messages to the recipient's language

Fixes #7241, Refs #3151
chore(mbstring): remove PHP 5.6 notices due to deprecated ini setting

In PHP 5.6 the ini setting mbstring.internal_encoding was deprecated. Solution
is to only set it if a value already exists.

Fixes #7244
Merge pull request #7307 from mrclay/7244_mbstring_errors

chore(mbstring): remove PHP 5.6 notices due to deprecated ini setting
Merge pull request #7275 from juho-jaakkola/7241-notification_languages

fix(i18n): translate notification messages to the recipient's language
Merge pull request #7306 from mrclay/6583_bookmark_widget

fix(bookmarks): fixes more link in group bookmarks widget
fix(i18n): improved change password email subject and body text

fixes #6960
Merge pull request #7310 from jdalsem/password-change-translation

fix(i18n): improved change password email subject and body text
fix(widgets): determine default values for num display in content view

also fixed some widget content view not using the widget setting num
display for the output

fixes #6923, #7041
fix(search): keep container param intact when navigating search results

fixes #7250
fix(css): removed datepicker fixed width causing visual bug

datepicker can handle different font sizes, but changing the font size
causes visual issues (too much padding, or text overflow)

fixes #4964