Allow ui.xml to include additional xml files to read

Use common portrait and landscape xml files based on resolution
defined by the device.

Change-Id: Iec528f9d846d49857ff98de1ac201e25dbb60339
add 1440x2560 theme to TWRP

Based on work by Chris Phelps <cphelps76@droidconcepts.com>
https://github.com/TEAM-Gummy/android_bootable_recovery_TWRP/commit/58963336b81ea8bcc03b8d7e4dfe4598f5afc972
https://github.com/TEAM-Gummy/android_bootable_recovery_TWRP/commit/4ec10303cb76592044c3aa449dc68a33356a6e09
https://github.com/TEAM-Gummy/android_bootable_recovery_TWRP/commit/c48bd2412332916eafd0db727d923c8c16cd35ed
https://github.com/TEAM-Gummy/android_bootable_recovery_TWRP/commit/f0944ded30e98917ca85db0185add1207ea5f4b6
But with other original changes too.

Change-Id: I809a37a3983187e62568a1e2403b6637a692220d