Singleton safe getter

[rascar-capac]

This hasn't been tested but I just wanted to have your opinion on it.

TryGetInstance() can be called instead of using HasInstance before getting the instance.
The main benefit is that we can actually use the FindObjectOfType in the getter and fetch any instance present in the scene before the Awake is called.
The workaround we used on Corsairs was to change the script execution order, but I find this more convenient.

I'll test it and update the version if you find it useful.

---

This change is 

[LouisNillusFC]

Reviewed 1 of 1 files at r1, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @rascar-capac)

[MaxDaniels]

Reviewed 1 of 1 files at r1, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @rascar-capac)

[fishingcactus-nathan-istace]

Reviewed 1 of 1 files at r1, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @rascar-capac)

[lucas-baran]

Reviewed 1 of 1 files at r1, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @rascar-capac)