Removing Hast.Core since it's not needed in the client branch

Author: Piedone

.gitmodules

@@ -1,20 +1,16 @@
-[submodule "Hast.Remote.Bridge"]
-	path = Hast.Remote.Bridge
-	url = https://github.com/Lombiq/Hastlayer-Remote-Bridge.git
-	branch = dev
-[submodule "Hast.Core"]
-	path = Hast.Core
-	url = https://github.com/Lombiq/Hastlayer-Core.git
-	branch = dev
-[submodule "Lombiq.Arithmetics"]
-	path = Lombiq.Arithmetics
-	url = https://github.com/Lombiq/Arithmetics.git
-	branch = dev
-[submodule "Hastlayer-Hardware-Framework---Vitis"]
-	path = Hastlayer-Hardware-Framework---Vitis
-	url = https://github.com/Lombiq/Hastlayer-Hardware-Framework---Vitis
-	branch = dev
-[submodule "Libraries/Lombiq.HelpfulLibraries"]
-	path = Libraries/Lombiq.HelpfulLibraries
-	url = https://github.com/Lombiq/Helpful-Libraries.git
-	branch = orchard-core-preview
+[submodule "Hast.Remote.Bridge"]
+	path = Hast.Remote.Bridge
+	url = https://github.com/Lombiq/Hastlayer-Remote-Bridge.git
+	branch = dev
+[submodule "Lombiq.Arithmetics"]
+	path = Lombiq.Arithmetics
+	url = https://github.com/Lombiq/Arithmetics.git
+	branch = dev
+[submodule "Hastlayer-Hardware-Framework---Vitis"]
+	path = Hastlayer-Hardware-Framework---Vitis
+	url = https://github.com/Lombiq/Hastlayer-Hardware-Framework---Vitis
+	branch = dev
+[submodule "Libraries/Lombiq.HelpfulLibraries"]
+	path = Libraries/Lombiq.HelpfulLibraries
+	url = https://github.com/Lombiq/Helpful-Libraries.git
+	branch = orchard-core-preview