Allow pinch to zoom in fullscreen SelectionActivity

[mkrupczak3]

Description

Currently, the app allows tap to locate target selection in both the MainActivity and a dedicated fullscreen SelectionActivity which appears larger on the screen.

In this fullscreen SelectionActivity, A user should be able to pinch to zoom (two touch gesture) and tap and drag (one touch gesture) to translate the zoomed window. Users expect this functionality from mobile apps, and it would make it easier to identify and select targets accurately.

User story

As a user, I want to pinch and zoom in the target selection activity, so that I can identify and select targets more accurately