[Suggestion] Add generalized solo unlock mechanic (solo talent points AND solo tech points)
*Add mechanic to be able to solo unlock tech or talents in the regular trees, using respectively solo tech points and solo talent points.
*Solo unlocks are marked "solo", and are only unlocked when playing solo.
*If you use regular points on something solo unlocked, then it becomes regular unlocked and the spent solo point is refunded.
*This keeps the need to be specialized when playing with others, while being able to unlock more stuff when playing solo.
*Does not require separate solo trees.