Help the population of the base grow.

This week, I changed some things that make the game more playable, so I'm interested in receiving your feedback.

1. Changed the text of the introduction window to explain a bit better the objective of the game.
2. Entities will only appear once seen by the field of view of the explorer.
3. While you explore a sector: There is a radar that shows creature position in a sonar like manner.
4. Fixed a bug where you moved to the same place you where shooting.
5. Now you can see the population inside the base, and how many resources you need to extract to advance to the next population level.