switch from waf to rscons

Makefile

@@ -1,20 +1,7 @@
+.PHONY: all
 all:
-	./waf build --targets jes
+	./rscons build
 
 .PHONY: clean
 clean:
-	./waf clean
-
-ifneq ($(FILTER),)
-  GTEST_FILTER := --gtest_filter=$(FILTER)
-endif
-
-.PHONY: build_tests
-build_tests:
-	./waf build --targets tests
-
-.PHONY: test
-test: build_tests
-	./build/tests $(GTEST_FILTER)
-	@-rm -rf coverage
-	-gcovinator -b build -s src
+	./rscons clean