Updates to star collector from play testing feedback

[K-Meech]

For #55

Changes:

• Made the time limit increment configurable via the unity editor (was previously fixed at 30 seconds)

• Added the concept of 'win streaks' to match the implementation of the other games. Now you can set a certain number of games in a row that must meet the upgrade criteria in order to increase the time limit.

• I changed the starCreationDistance parameter (the y distance between stars) to a starSampling parameter (number of stars to spawn per cycle of the wave). This made it easier to try different levels of swerve (i.e. different wave frequencies) while still getting adequate sampling to see the wave shape.

• Increased the base star speed, but mostly increased the wave's 'swerve' (i.e. made it oscillate more frequently left to right). Speed increases alone made the stars very hard to follow visually, so a balance of speed + tighter wave oscillation seemed to work best.

I've sent updated game builds to David, so hopefully he can give input on the star speed / wave shape. It may be easier to try out different parameters with him live on a call, so you can quickly cycle through options and see what fits best.

[thompson318]

This works for me and has no conflicts with main now. I do get bad behaviour if I set start sampling to be anything greater than ~12. I think it's worth digging a bit deeper in the cause of that before merging.

[thompson318]

There seems to be a maximum value for this before the level crashes. 12 worked for me but 14 gives the following error.

Which is

AstroBalance/projects/AstroBalance/Assets/Scripts/StarCollector/Star.cs

Line 37 in 60f25fb

if (!gameManager.IsGameActive())

Perhaps there is a failure in creating the game manager when star sampling is too high. Would be worth looking into in case it's a more general bug. Other wise we could just constrain the allowable values of star sampling.