Adds Primed Thrusters upgrade

[rub8n]

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[Sandrem]

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[Sandrem]

1. Why "Movement.ManeuverColor.Red" is checked? Can this check be removed?
   Please, check situation where ship has 3 stress tokens and them performs green maneuver.
   (You can use console command "tokens assign" for testing)

2. I don't like that you unsibscribe from Rules.StressRule. You can cause bug in another upgrades like Chopper crew. (I don't remember any rebel ship with tech and crew, but it can be added in future.)
   Maybe it is better to use "action.CanBePerformedWhileStressed" for BR/Boost?

3. You call "Ship can perform free Boost or Barrel Roll". This is different from card's text and maybe can cause unknown problems.

Overall, I like quality of code, but I think that we can use more elegant solution.
So, I propose to use event "Phases.BeforeActionSubPhaseStart" to check number of stress tokens and set "action.CanBePerformedWhileStressed" to "true". In this case they will be shown in usual "Choose action to perform" window, and you don't need to unsubscribe from rules / call "perfrom free action" method.
If you have questions - contact me on Slack or here.

[rub8n]

Sounds good. I'll take a look at your suggestions and send an update in the next few days.