prebuilts: sync with Droid-VM/DroidVM-Prebuilts
ui: add HugePageActivity
backend: add QemuBackend
TextInputRowWidget: add onFocusLost and onEditorAction
ConsoleStream: fix resource leak
SimpleConsoleStream: set to readable
BackendBase: add multiple VM backend supports
CrosvmBackendInstance: move basic setup to VMBackendInstance
VMConfig: add use_uefi config item
VMEditBasicTab: add backend choose
Full Changelog: 0.0.4...0.0.5