Updated make files/scripts to accomodate execution/building in windows in addition to linux/mac (#4135)

Makefile

@@ -377,22 +377,25 @@ run-fullmap: run-server run-client-fullmap
 stop-server:
 	@echo Stopping mattermost
 
+ifeq ($(BUILDER_GOOS_GOARCH),"windows_amd64")
+	wmic process where "Caption='go.exe' and CommandLine like '%go.exe run%'" call terminate
+	wmic process where "Caption='mattermost.exe' and CommandLine like '%go-build%'" call terminate
+else
 	@for PID in $$(ps -ef | grep "[g]o run" | awk '{ print $$2 }'); do \
 		echo stopping go $$PID; \
 		kill $$PID; \
 	done
-
 	@for PID in $$(ps -ef | grep "[g]o-build" | awk '{ print $$2 }'); do \
 		echo stopping mattermost $$PID; \
 		kill $$PID; \
 	done
+endif 
 
 stop-client:
 	@echo Stopping mattermost client
 
 	cd $(BUILD_WEBAPP_DIR) && $(MAKE) stop
 
-
 stop: stop-server stop-client
 
 restart: restart-server restart-client