AK3: add support for avb patching (#70)

- this supports custom kernel users to continue not having to fastboot reflash vbmeta with --disable-verity and --disable-verification, now that Magisk 24303+ no longer patches avb out of the fstab on-the-fly at boot time
- checks for an avb option in the fstab entry for the current partition
- if found, it checks if verity or verification is disabled on the top-level vbmeta, and if so, appends a hashtree and FEC data to the partition and updates the hashtree descriptor in the vbmeta partition referenced in the avb option

LICENSE

@@ -94,6 +94,50 @@ lptools_static: Apache License 2.0
     Source not required, however, respective source is provided:
     https://github.com/phhusson/vendor_lptools
 
+httools_static: MIT
+
+    Copyright (c) 2022 capntrips
+
+    Permission is hereby granted, free of charge, to any person obtaining a copy
+    of this software and associated documentation files (the "Software"), to deal
+    in the Software without restriction, including without limitation the rights
+    to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+    copies of the Software, and to permit persons to whom the Software is
+    furnished to do so, subject to the following conditions:
+
+    The above copyright notice and this permission notice shall be included in all
+    copies or substantial portions of the Software.
+
+    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+    SOFTWARE.
+
+    Source not required, however, respective source is provided:
+    https://github.com/capntrips/HashtreePatcher
+
+fec: Apache License 2.0
+
+    Copyright (c) 2013-2015, The Android Open Source Project
+
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+         http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+
+    Source not required, however, respective source is provided:
+    https://android.googlesource.com/platform/system/extras/+/refs/tags/android-12.1.0_r5/verity/fec/
+
 
 ## Optional Binary Licenses: