Make casing of csproj and assemblies consistent

[akoeplinger]

Right now the casing of the csproj's is inconsistent, leading to output assemblies with names like this e.g. for net461:

We should either make everything lowercase, or use the casing the assemblies have used in the past everywhere.

[weshaggard]

LOL... Sorry about that I noticed myself being inconsistent about that but didn't fix it (I guess I'm too used to windows).

I think we should make these proper casing for the ones that match namespaces, but I do think I will make netstandard itself all lowercase.

[akoeplinger]

Sounds good 👍

[terrajobst]

but I do think I will make netstandard itself all lowercase.

👍

[weshaggard]

1325532 should hopefully fix this. @akoeplinger let me know if you see some I missed.

[akoeplinger]

I found a few more: #42