Fix TransformContext properties

[skip ci] Update README & RELEASE-NOTES

support productflavor

Support AGP 8.0 & 8.1 & 8.2

Fix issue #422: end-of-stream caused by multiple collector

Fix issue #422: end-of-stream caused by multiple collector

Ignore Android SDK extension

Ignore Android SDK extension

[skip ci] Update README & RELEASE-NOTES

Apple M1 chipset support for cwebp