Makefile: clean up the make clean process a bit

Makefile

@@ -6,6 +6,11 @@ all:
 	cd dos33fs-utils && make
 	cd hgr-utils && make
 	cd gr-utils && make
+	cd mode7 && make
+	cd mode7_demo && make
+	cd still_alive && make
+	cd tfv && make
+	cd two-liners && make
 
 install:
 	cd asoft_basic-utils && make install
@@ -13,6 +18,11 @@ install:
 	cd dos33fs-utils && make install
 	cd hgr-utils && make install
 	cd gr-utils && make install
+	cd mode7 && make install
+	cd mode7_demo && make install
+	cd still_alive && make install
+	cd tfv && make install
+	cd two-liners && make install
 
 clean:
 	cd asoft_basic-utils && make clean
@@ -20,6 +30,11 @@ clean:
 	cd dos33fs-utils && make clean
 	cd hgr-utils && make clean
 	cd gr-utils && make clean
+	cd mode7 && make clean
+	cd mode7_demo && make clean
+	cd still_alive && make clean
+	cd tfv && make clean
+	cd two-liners && make clean
 	rm -f *~
 
 test:

mode7_demo/Makefile

@@ -58,4 +58,4 @@ mode7_demo_backgrounds.inc:	$(PNG2RLE) \
 
 clean:	
 	rm -f *~ *.o MODE7_DEMO MODE7_DEMO_C MODE7_DEMO.lz4 *.lst
-
+	cd docs && make clean

still_alive/Makefile

@@ -61,3 +61,4 @@ TITLE.BAS:	title.bas
 
 clean:	
 	rm -f *~ *.o *.lz4 *.lst STILL_ALIVE SA_ED ENDING SA_COMPRESSED
+	cd art && make clean