[2021] [Development] Simplified profit/earning system in EC missions

EC missions (all of them) differ from other game modes because of their duration (session time), respawns and game room (lobby) mechanics.

The extended duration of the mission and low concentration of gameplay actions results in a large reward for each individual action. The system of multiple respawns is implemented through a ‘cost’ for each fly out and not vehicle loss. Both of these points make the economy system noticeably more difficult to set up and understand for players - a player when respawning in a vehicle initially has a shortage of game currency and then has to do without re