Android supported base64

feat: fix #28 Android supported base64

support android local/remote/assets background

feat: fix #27 support android local/remote/assets background

Adapt RN 0.58

• fix #26 adapt rn v0.58
• fix #25 iOS multi time op make image size incorrect
• fix #24 allow output name self-definition

Add optional filename option

Add optional filename option

Fix Expo Android static resources problem

• fix #23 Expo Android static resources problem
• update example project

Support iOS pod

Support iOS pod and release a tag for pod install

support use bundled image

• support to use bundled images for marking
• support multiline text mark