(TB) Delete All System Logs Button

This plugin adds a (much needed) "Delete All Logs" button in the System Logs area to easily delete all logs.

Features:

• The button is enabled only if there are logs to delete.
• No accidentals delete, the button requires a confirmation checkbox to be clicked.
• Option to delete only errors in certain categories rather than all logs.
• Supports also file-based logs.
• All actions are logged in the Administrator Logs.