* Fix off-by-one error in HttpHeaderLink
Link headers with multiple URLs with multiple parameters were being parsed
incorrectly.
Detected by adding unit tests ahead of converting to Kotlin.
* Convert util/HttpHeaderLink from Java to Kotlin
* Convert util/ThemeUtils from Java to Kotlin
* Convert util/TimestampUtils from Java to Kotlin
* Add tests for PairedList
* Convert util/PairedList from Java to Kotlin
* Implement feedback from PR
* Relicense as GPL
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