Implements sqlmapproject#2647 (Basic authorization for sqlmapapi)

Minor update

Fixes sqlmapproject#2556

Fixes sqlmapproject#2511

Implementation for an Issue sqlmapproject#1895

Adding option --web-root (Issue sqlmapproject#2419)

Update for sqlmapproject#2378

New version preparation

Adding new tamper script plus2concat (thank you Luka Pusic)

Patch related to sqlmapproject#2257