Remove unused spectre-console (#467)

Author: MichaelSimons

.gitmodules

@@ -25,9 +25,6 @@
 [submodule "abstractions-xunit"]
 	path = src/abstractions-xunit
 	url = https://github.com/xunit/abstractions.xunit
-[submodule "src/spectre-console"]
-	path = src/spectre-console
-	url = https://github.com/spectreconsole/spectre.console
 [submodule "src/vs-solutionpersistence"]
 	path = src/vs-solutionpersistence
 	url = https://github.com/microsoft/vs-solutionpersistence.git