Commented out System.Threading.Tasks lines, which don't appear to be available in KSP's assembly, and appear to be unused in QuantumStrut.
[QuantumStrutsContinued.git] /
-rwxr-xr-x 6440 CoreStrut.cs
drwxr-xr-x Parts
drwxr-xr-x Properties
-rwxr-xr-x 9896 QuantumStrut.cs
-rwxr-xr-x 16012 QuantumStrutCore.cs
-rwxr-xr-x 5825 Strut.cs
-rwxr-xr-x 3854 Util.cs