(GH-1328) Serialize/deserialize package files warnings

Instead of defaulting to errorrs, silently have those warnings come up.
When installing the package, if the save of the files snapshot fails,
log a warning but allow the install to be successful.

This corrects seeing these kinds of errors:

~~~
Error deserializing response of type
chocolatey.infrastructure.app.domain.PackageFiles:
 '.', hexadecimal value 0x00, is an invalid character. Line 1, position
1.
~~~

src/chocolatey/infrastructure.app/services/ChocolateyPackageInformationService.cs

@@ -66,8 +66,9 @@ public ChocolateyPackageInformation get_package_information(IPackage package)
                         packageInformation.RegistrySnapshot = _registryService.read_from_file(_fileSystem.combine_paths(pkgStorePath, REGISTRY_SNAPSHOT_FILE)); 
                     }, 
                     "Unable to read registry snapshot file for {0} (located at {1})".format_with(package.Id, _fileSystem.combine_paths(pkgStorePath, REGISTRY_SNAPSHOT_FILE)), 
-                    throwError: false, 
-                    logWarningInsteadOfError: true
+                    throwError: false,
+                    logWarningInsteadOfError: true,
+                    isSilent: true
                  );     
 
             FaultTolerance.try_catch_with_logging_exception(
@@ -77,7 +78,8 @@ public ChocolateyPackageInformation get_package_information(IPackage package)
                     }, 
                     "Unable to read files snapshot file", 
                     throwError: false, 
-                    logWarningInsteadOfError: true
+                    logWarningInsteadOfError: true, 
+                    isSilent:true
                  );
 
             packageInformation.HasSilentUninstall = _fileSystem.file_exists(_fileSystem.combine_paths(pkgStorePath, SILENT_UNINSTALLER_FILE));
@@ -127,7 +129,15 @@ public void save_package_information(ChocolateyPackageInformation packageInforma
 
             if (packageInformation.FilesSnapshot != null)
             {
-                _filesService.save_to_file(packageInformation.FilesSnapshot, _fileSystem.combine_paths(pkgStorePath, FILES_SNAPSHOT_FILE));
+                FaultTolerance.try_catch_with_logging_exception(
+              () =>
+              {
+                  _filesService.save_to_file(packageInformation.FilesSnapshot, _fileSystem.combine_paths(pkgStorePath, FILES_SNAPSHOT_FILE));
+              },
+                  "Unable to save files snapshot",
+                  throwError: false,
+                  logWarningInsteadOfError: true
+               );
             }
 
             if (!string.IsNullOrWhiteSpace(packageInformation.Arguments))