Get rid of JNA

[ffissore]

Several issues are related to exceptions like

java.lang.UnsatisfiedLinkError: com.sun.jna.Native.pointerSize()I
        at com.sun.jna.Native.pointerSize(Native Method)
        at com.sun.jna.Native.<clinit>(Native.java:93)
        at processing.app.windows.Advapi32.<clinit>(Advapi32.java:21)
        at processing.app.windows.Registry.getStringValue(Registry.java:115)
        at processing.app.windows.Platform.getSettingsFolder(Platform.java:193)
        at processing.app.BaseNoGui.getSettingsFolder(BaseNoGui.java:287)
        at processing.app.BaseNoGui.getSettingsFile(BaseNoGui.java:272)
        at processing.app.PreferencesData.init(PreferencesData.java:38)
        at processing.app.BaseNoGui.initParameters(BaseNoGui.java:946)
        at processing.app.Base.guardedMain(Base.java:151)
        at processing.app.Base.main(Base.java:131)

Try solving them updating bundled jna to latest stable available

Update
JNA is only used on Windows, to associate .ino files to the unzipped IDE. The same thing is done by the windows installer, only using two different registry keys. Get rid of JNA and thus the registry modifications done by the java code: registry will be modified by the installer only