Build

Add flex support, recovery app and new pallets #30

Job	Run time
build_only_rust	22s
configure	1s
build	1m 25s
test_zemu	8m 38s
build_ledger	1m 43s
size_nano_s	1s
build_package_stax	0s
build_package_nanos_xl	0s
build_package_nanosp	0s
build_package_nanos	0s
build_package_recovery_flex	0s
build_package_flex	0s
build_package_recovery_nanos	0s
build_package_recovery_nanos_xl	0s
build_package_recovery_nanosp	0s
build_package_recovery_stax	0s
	12m 10s

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