Create default TOC style with options to use the theme css

If there is functions.php inside themes root, include it.

If you upload an image on one of the sites, change the image address to relative path.

Fully support PHP 8.x

Allowing to set the tagcloud number

For better flexibility

system/htmly.php
- Loads language files from folder lang/
- Sets language settings for date and time format
system/includes/dispatch.php
- function i18n() returns translated strings

The ported version of Twenty Fifteen and Twenty Sixteen include with the
package. Maintenance and bugs fixes.

Improving template engine for more flexible theming. Add
cache.expiration.

Add new config: static.frontpage = "true" to enable the static
frontpage.

Use the pagedown extra instead of standard pagedown. Adding
sitemap.category.xml

Add category feature to the core.

Feature to change Sitemap priorities direct with the "config.ini" for
SEO. Additionally this commit adds the "lastmod" tag for posts.

- Set the Sitemap priorities for subtypes (Base, Post, Static, Tag, ...)
within the config.ini
- Values beween 1.0 and 0.0 or "false" to disable a subtype.
- Default priority is 0.5 as fallback. (see functions.php) The default
for "base" (Homepage) is 1.0.
- Disabled subtypes aren't available in the sitemap.xml (index).
- The sitemap for posts now contains the "lastmod" set the the post's
date.

Add new theme blog

This reverts commit 7963ae9854.

Added user password encryption

Add backup feature to the core.

FOr got FB appid

Loading jQuery without using it is stupid. Add options for it.

Improve comments

Add Facebook comments as comment system options.

Add lightbox config.

Add lightbox as an inline image handling.