use central method to setup Jackson in locked down setup

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This is based on @pserwlyo's work.  The App and Apk classes currently
need just the public instance variables auto-filled by Jackson, so
everything else is considered opt-in, via @JsonProperty declarations.
This is currently only used for setLocalized(), setUsesPermission(),
and setUsesPermissionSdk23().

# Conflicts:
#	app/src/test/java/org/fdroid/fdroid/updater/IndexV1UpdaterTest.java

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