Update SolverEngines.dll

* SolverEngines.dll version 3.7.4

Merge pull request KSP-RO#40 from Starwaster/master

Compiled for KSP 1.6.1

Merge pull request KSP-RO#39 from raidernick/master

update again for ksp 1.5.1

Merge pull request KSP-RO#38 from raidernick/master

Update for ksp 1.4.5

Prep for v3.7.0

Prep for v3.6.2

Prep for v3.6.1

Prep for v3.6 - Merge pull request KSP-RO#35 from aw1621107/update-fo…

…r-KSP-1.4.1

Update for KSP 1.4.1

Prep for v3.5

Prep for v3.4