twrpinstall: create library for twrpinstall

This library will need to mirror AOSP for any changes to installing
packages. The library has been separated out in order to make importing
updates from AOSP into the TWRP project.

twinstall.cpp has been removed from the recovery binary and added to
this library. It has been refactored for libziparchive.

Sideload has been reworked to use the newer methods from AOSP on
flashing packages through adb sideload.

We are also removing old libraries for adb and verifier.

Lastly before flashing a zip or image, we want to unlock block devices
for writing so that when an OTA is flashed to the inactive slot,
the flash will succeed.

Change-Id: I6d8702fc9031ffaf9f666b4ba375dc7d9362e473
diff --git a/partitions.hpp b/partitions.hpp
index 284baeb..9c2b65f 100755
--- a/partitions.hpp
+++ b/partitions.hpp
@@ -391,6 +391,7 @@
 	bool Recreate_Logs_Dir();                                                 // Recreate TWRP_AB_LOGS_DIR after wipe
 	std::vector<users_struct>* Get_Users_List();                              // Returns pointer to list of users
 	int Set_FDE_Encrypt_Status();                                             // Sets encryption state for FDE devices (ro.crypto.state and ro.crypto.type)
+	void Unlock_Block_Partitions();                                           // Unlock all block devices after update_engine runs
 	void Setup_Settings_Storage_Partition(TWPartition* Part);                 // Sets up settings storage