Fix: makefile error and compile warnings#22
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1. Remove -source 1.6 -target 1.6 to fix `error: Source/Target option 6 is no longer supported. Use 7 or later.` 2. Modify the jdk source in Dockerfile from java:openjdk-7-jdk to amazoncorretto:8 3. Modify `src/Graphwar/GameData.java:369` from `new Integer(level)` to `level` to fix src/Graphwar/GameData.java:369: warning: [removal] Integer(int) in Integer has been deprecated and marked for removal nextPCs.add(new Integer(level)); 4. Replace `Toolkit.getDefaultToolkit()` with `this` in `GlobalScreen.java:236` and `MainMenuScreen.java:298` to fix warning: [deprecation] getFontMetrics(Font) in Toolkit has been deprecated
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error: Source/Target option 6 is no longer supported. Use 7 or later.src/Graphwar/GameData.java:369fromnew Integer(level)tolevelto fix src/Graphwar/GameData.java:369: warning: [removal] Integer(int) in Integer has been deprecated and marked for removal nextPCs.add(new Integer(level));Toolkit.getDefaultToolkit()withthisinGlobalScreen.java:236andMainMenuScreen.java:298to fix warning: [deprecation] getFontMetrics(Font) in Toolkit has been deprecated