Fixed some bugs

Fixed bugs when the plugin was activated.

Support for PHP 8 and more changes.

-Compatibility extended up to PHP 8.
-Disable Gravatar function added.
-Default avatar can be add anymore.
-Some bugs fixed.
-Some design changes have been made.

Bugs fixed.

Some bugs fixed.

User permissions added.

Some design changes.
Assigning permission to change profile avatar based on user role.

Some design changes.

* Some design changes.
* Custom Profile Avatar logo changed.

Many language support has been added.

Update readme.txt