Reduce libs needed for decrypt and clean up old decypt files

Trim cryptfs.c to remove functions that TWRP does not use for
decrypt and remove the need for libfs_mgr from cryptfs.c by
passing some items to cryptfs.c from the partition manager.

Add support for new fstab flags:
encryptable and forceencrypt=/path/to/cryptokey
For example:
Note that "footer" is the default, so you do not need to set this
flag on devices that use the footer for the crypto key.
Also add mounttodecrypt if you need to mount a partition during
the decrypt cycle for firmware of proprietary libs.

Clean up decrypt and only support one version

Android 5.0 lollipop decrypt should be backwards compatible with
older versions so we will only support one version, 1.3 that came
with 5.0 lollipop.

Remove support for Samsung TouchWiz decrypt. It does not work with
the latest versions of Samsung encryption anyway and it has not
been updated to work with any AOSP decryption higher than 1.1

Change-Id: I2d9c6e31df50268c91ee642c2fa090f901d9d5c9
diff --git a/partitions.hpp b/partitions.hpp
index 3f5aadd..48c339d 100644
--- a/partitions.hpp
+++ b/partitions.hpp
@@ -73,6 +73,7 @@
 	string Actual_Block_Device;                                               // Actual block device (one of primary, alternate, or decrypted)
 	string MTD_Name;                                                          // Name of the partition for MTD devices
 	bool Is_Present;                                                          // Indicates if the partition is currently present as a block device
+	string Crypto_Key_Location;                                               // Location of the crypto key used for decrypting encrypted data partitions
 	bool Has_Data_Media;                                                      // Indicates presence of /data/media, may affect wiping and backup methods
@@ -141,6 +142,7 @@
 	bool Can_Be_Encrypted;                                                    // This partition might be encrypted, affects error handling, can only be true if crypto support is compiled in
 	bool Is_Encrypted;                                                        // This partition is thought to be encrypted -- it wouldn't mount for some reason, only avialble with crypto support
 	bool Is_Decrypted;                                                        // This partition has successfully been decrypted
+	bool Mount_To_Decrypt;                                                    // Mount this partition during decrypt (/vendor, /firmware, etc in case we need proprietary libs or firmware files)
 	string Display_Name;                                                      // Display name for the GUI
 	string Backup_Name;                                                       // Backup name -- used for backup filenames
 	string Backup_Display_Name;                                               // Name displayed in the partition list for backup selection
@@ -159,9 +161,6 @@
 	int Format_Block_Size;                                                    // Block size for formatting
 	bool Ignore_Blkid;                                                        // Ignore blkid results due to superblocks lying to us on certain devices / partitions
 	bool Retain_Layout_Version;                                               // Retains the .layout_version file during a wipe (needed on devices like Sony Xperia T where /data and /data/media are separate partitions)
-	string EcryptFS_Password;                                                 // Have to store the encryption password to remount
 friend class TWPartitionManager;
 friend class DataManager;