fastboot: implement fastbootd in twrp

fastbootd is a userspace daemon that runs in the recovery
ramdisk. It allows writing single partitions to the super
partition via fastboot CLI. When TWRP sees the fastboot option
in the misc partition during startup, it will start with
the fastbootd page and fastbootd running. Otherwise it will
run recovery normally.

Change-Id: Id7b12d29ef21dbd5950dc884dd1cd788f25357f0
diff --git a/gui/theme/common/languages/en.xml b/gui/theme/common/languages/en.xml
index 7982a3b..fa8058a 100755
--- a/gui/theme/common/languages/en.xml
+++ b/gui/theme/common/languages/en.xml
@@ -727,5 +727,9 @@
 		<string name="ozip_decrypt_decryption">Starting Ozip Decryption...</string>
 		<string name="ozip_decrypt_finish">Ozip Decryption Finished!</string>
 		<string name="fbe_wipe_msg">WARNING: {1} wiped. FBE device should be booted into Android and not Recovery to set initial FBE policy after wipe.</string>
+		<string name="fastboot_button">Fastboot</string>
+		<string name="enable_adb">Enable ADB</string>
+		<string name="enable_fastboot">Enable Fastboot</string>
+		<string name="fastboot_console_msg">Entered Fastboot mode...</string>
 	</resources>
 </language>