Added Everything 1.5a to Applications (Includes Dark mode)

[sbrandsen]

This is the same publisher as the Everything Search already included, but has a dark theme (among numerous other improvements)

Don't get intimidated by the "Alpha" software release life cycle, it was released on 2021-03-13 and has been very stable.

For more details, you can refer to the Everything 1.5a announcement here and the Winget package link here.