Border Wars: Juegos militares

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Added achicevemnts and difficulty balancing for endless mode:
- At higher wavenumbers, reduced the difficulty curve of enemy units.
- Unlocking new units now contribute to the power factor calculation.
- Effect of money level upgrades on power factor reduced to 20%.
- Starting push of enemies better scaled to relevant power factors.
- Starting at high power factors give breathing room of 3 waves.