Pull in most TWRP sources
Stub out partition management code
Make it compile -- probably will not boot
Kind of a mess but have to start somewhere

Replace the device-specific functions with a class.  Move some of the
key handling (for log visibility toggling and rebooting) into the UI
class.  Fix up the key handling so there is less crosstalk between the
immediate keys and the queued keys (an increasing annoyance on
button-limited devices).

Change-Id: I698f6fd21c67a1e55429312a0484b6c393cad46f

Replace the device-specific functions with a class.  Move some of the
key handling (for log visibility toggling and rebooting) into the UI
class.  Fix up the key handling so there is less crosstalk between the
immediate keys and the queued keys (an increasing annoyance on
button-limited devices).

Change-Id: I8bdea6505da7974631bf3d9ac3ee308f8c0f76e1

Change-Id: I423a23581048d451d53eef46e5f5eac485b77555

Change-Id: I68a67a4c8edec9a74463b3d4766005ce27b51316

Change-Id: I8f78377555c658a992ca95cadf11b67ddc93fed8

Change some of the UI parameters (# of indeterminate progress bar
frames, fps, etc.) from #defined constants to variables that can be
set by the device-specific recovery_ui code (via a new function).

Support overlaying different images on top of the base installation
icon to animate it.  Make the FPS control more accurate.

Change-Id: I9268b389b7ea6b3ed9e0c7eae37baf4272e60edd

Allow sideloading of OTA packages from USB drives that appear as
/dev/block/sda1.

Change-Id: I1908576c24547cd0088475d8c8917699cd906868

Remove (or at least stop calling) the HTC-specific mechanism for
preserving the recovery log from before a radio or hboot update.
Replace it with a generic device_recovery_start() function which each
device's code can implement to do whatever it wants on recovery
startup.

Change-Id: If3cca4b498c0b1cf0565236404ecf56a1fc46123

gcc 4.4 complains about some of the recovery ui functions not being
declared.  To include the header, we have to fix the 'volatile'
declaration (otherwise there's a compiler error).

Move the dream-specific images to vendor/htc/dream, make the default
images a generic phone.

Some devices want to do special things when recovery wipes data (eg,
wipe data in their baseband processor as well).  Add a hook in the
device-specific recovery library that gets called when data is wiped.

Also add an amend root for the "mbm" partition.

Take some device-specific details of the recovery UI (eg, what keys to
press to bring up the interface and perform actions, exact text of the
menu, etc.) and split them out into separate C functions.  Arrange to
take implementations of those functions from the appropriate vendor
directory at build time.  Provide a default implementation in case no
vendor-specific one is available.