Add cleaer screen, timezone, and some other additions

Makefile

@@ -9,7 +9,7 @@ SRCS=src/main.c src/util.c src/lcd.c src/ths.c src/button.c src/ui/screen.c\
      src/ui/datesel.c src/ui/statsby.c src/ui/datapoints.c src/ui/timesel.c\
      src/ui/statrange.c src/config.c src/ui/blankscreen.c src/drive.c\
      src/ui/exportscreen.c src/ui/setdatescreen.c src/ui/viewdatescreen.c\
-	 src/ui/powerscreen.c
+	 src/ui/powerscreen.c src/ui/settzscreen.c src/ui/cleardatascreen.c
 PROG=rpi4b-temp-humidity
 
 all: config.conf bin/${PROG}
@@ -24,16 +24,19 @@ bin/main.o bin/util.o bin/lcd.o bin/ths.o bin/button.o: src/util.h
 bin/ui/screen.o bin/ui/statsby.o bin/ui/datesel.o: src/util.h
 bin/ui/datapoints.o bin/ui/timesel.o bin/ui/statrange.o: src/util.h
 bin/ui/viewdatescreen.o bin/ui/setdatescreen.o bin/ui/powerscreen.o: src/util.h
+bin/ui/settzscreen.o bin/ui/cleardatascreen.o: src/util.h
 
 bin/main.o bin/lcd.o bin/screen.o bin/ui/datesel.o: src/lcd.h
 bin/ui/statsby.o bin/ui/timesel.o bin/ui/statrange.o: src/lcd.h
 bin/ui/datapoints.o bin/ui/viewdatescreen.o: src/lcd.h
 bin/ui/setdatescreen.o bin/ui/powerscreen.o: src/lcd.h
+bin/ui/settzscreen.o bin/ui/cleardatascreen.o: src/lcd.h
 
 bin/main.o bin/ui/screen.o bin/ui/statsby.o: src/ui/screen.h
 bin/ui/datesel.o bin/ui/datapoints.o bin/ui/timesel.o: src/ui/screen.h
 bin/ui/statrange.o bin/ui/setdatescreen.o: src/ui/screen.h
 bin/ui/viewdatescreen.o bin/ui/powerscreen.o: src/ui/screen.h
+bin/ui/settzscreen.o bin/ui/cleardatascreen.o: src/ui/screen.h
 
 bin/main.o bin/ui/datesel.o bin/ui/statsby.o: src/ui/datesel.h
 bin/ui/datapoints.o bin/ui/timesel.o bin/ui/statrange.o: src/ui/datesel.h
@@ -53,6 +56,8 @@ bin/main.o bin/ui/exportscreen.o: src/ui/exportscreen.h
 bin/main.o bin/ui/setdatescreen.o: src/ui/setdatescreen.h
 bin/main.o bin/ui/viewdatescreen.o: src/ui/viewdatescreen.h
 bin/main.o bin/ui/powerscreen.o: src/ui/powerscreen.h
+bin/main.o bin/ui/settzscreen.o: src/ui/settzscreen.h
+bin/main.o bin/ui/cleardatascreen.o: src/ui/cleardatascreen.h
 bin/main.o bin/drive.o bin/ui/exportscreen.o: src/drive.h
 
 .if "${DEFAULT_TEMP_UNIT}" != "F" && "${DEFAULT_TEMP_UNIT}" != "C" &&\
@@ -71,6 +76,7 @@ DEFINES:=\
 -DDEFAULT_REFRESH_TIME="${DEFAULT_REFRESH_TIME}"\
 -DDEFAULT_TEMP_UNIT="${DEFAULT_TEMP_UNIT}"\
 -DDEFAULT_EXPORT_FILE_NAME="${DEFAULT_EXPORT_FILE_NAME}"\
+-DDEFAULT_TIMEZONE="${DEFAULT_TIMEZONE}"\
 
 ${OBJS}: ${.TARGET:C/^bin/src/:C/.o$/.c/}
 	@mkdir -p ${.TARGET:H}