Switch updater/MAR to LZMA compression #1859

To considerably save bandwidth for everyone, switching to LZMA-compressed MAR updater archives is the way to go.

This will be using our embedded xz library

Update xz-embedded version
Update xz-embedded build configuration to build it as a static lib for updater use
Switch the updater to use xz decompression instead of bz2
Update MAR generation scripts to use xz instead of bzip2 by default, but keep bzip2 as an option (so that both versions can be built for the transitional period)
Update unwrapping script to handle xz-compressed MARs
(external task) Update the AUS server script to handle MAR selection based on requesting application version.
Make sure the xz decompression lib is built when the updater is built.

To considerably save bandwidth for everyone, switching to LZMA-compressed MAR updater archives is the way to go. This will be using our embedded xz library - [x] Update xz-embedded version - [x] Update xz-embedded build configuration to build it as a static lib for updater use - [x] Switch the updater to use xz decompression instead of bz2 - [x] Update MAR generation scripts to use xz instead of bzip2 by default, but keep bzip2 as an option (so that both versions can be built for the transitional period) - [x] Update unwrapping script to handle xz-compressed MARs - [x] (external task) Update the AUS server script to handle MAR selection based on requesting application version. - [x] Make sure the xz decompression lib is built when the updater is built.

Leveraged the test server to verify the update process with xz-compressed MARs succeeds.
All looks good, merged and closing.

Leveraged the test server to verify the update process with xz-compressed MARs succeeds. All looks good, merged and closing.

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Switch updater/MAR to LZMA compression #1859