Backported: iMSCP::DbTasksProcessor from 1.3.x branch - Allows to process db tasks without spawning new process

Quote from i-MSCP Github (1.2.x)

Code

1. Backported: iMSCP::DbTasksProcessor from 1.3.x branch - Allows to process db tasks without spawning new process
2. Removed: afterDispatchRequest event
3. CS fixes
4. [ci skip]

Source: https://github.com/i-MSCP/imsc…fc5e9bce9038e82295113ffe8