Fixes for om 3.7.4

[rube200]

After Unturned update this plugin fail to install OM
If we try to access OpenMod.Nuget or Nuget package it will always fail and throw an exception.
For workaround i wrapped the calls and use reflection.

OpenMod.Installer.RocketMod >> Loading OpenMod assemblies. Ignore the message spam below.
(...)
OpenMod.Installer.RocketMod >> Caught exception while executing job "OpenModUnturnedInstallJob":
OpenMod.Installer.RocketMod >> Exception in OpenMod.Installer.RocketMod: System.TypeLoadException: Failure has occurred while loading a type.
  at OpenMod.Installer.RocketMod.Jobs.NuGetInstallJob+<>c__DisplayClass3_0.<ExecuteMigration>b__0 () [0x0004d] in <3a1c5a1b79ed453a9e2a7ba4bba1e676>:0 
  at System.Threading.Tasks.Task`1[TResult].InnerInvoke () [0x0000f] in <2161c9885dd04ff291b79db9349c4b9b>:0 
  at System.Threading.Tasks.Task.Execute () [0x00000] in <2161c9885dd04ff291b79db9349c4b9b>:0 
--- End of stack trace from previous location where exception was thrown ---

  at Nito.AsyncEx.Synchronous.TaskExtensions.WaitAndUnwrapException (System.Threading.Tasks.Task task) [0x00015] in <f598ed95c1954e82be51579b78883fe7>:0 
  at Nito.AsyncEx.AsyncContext+<>c__DisplayClass15_0.<Run>b__0 (System.Threading.Tasks.Task t) [0x0000b] in <a7e39b5fefc84c7f84a0f645cb157611>:0 
  at System.Threading.Tasks.ContinuationTaskFromTask.InnerInvoke () [0x00024] in <2161c9885dd04ff291b79db9349c4b9b>:0 
  at System.Threading.Tasks.Task.Execute () [0x00000] in <2161c9885dd04ff291b79db9349c4b9b>:0 
--- End of stack trace from previous location where exception was thrown ---

  at Nito.AsyncEx.Synchronous.TaskExtensions.WaitAndUnwrapException (System.Threading.Tasks.Task task) [0x00015] in <f598ed95c1954e82be51579b78883fe7>:0 
  at Nito.AsyncEx.AsyncContext.Run (System.Func`1[TResult] action) [0x0006c] in <a7e39b5fefc84c7f84a0f645cb157611>:0 
  at OpenMod.Installer.RocketMod.Helpers.AsyncHelperEx.RunSync (System.Func`1[TResult] task) [0x00000] in <3a1c5a1b79ed453a9e2a7ba4bba1e676>:0 
  at OpenMod.Installer.RocketMod.Jobs.NuGetInstallJob.ExecuteMigration (System.String[] args) [0x00005] in <3a1c5a1b79ed453a9e2a7ba4bba1e676>:0 
  at OpenMod.Installer.RocketMod.Jobs.JobsExecutor.Execute (System.Collections.Generic.List`1[T] jobsToExecute, System.String[] args) [0x00025] in <3a1c5a1b79ed453a9e2a7ba4bba1e676>:0 
Reverting...