Release v0.4

Version: 0.4
Commit: 81b8250

Two APKs: RootMyGalaxyNext-0.4.apk is the release build, and
RootMyGalaxyNext-0.4-debug.apk is the same code with debugging on. Both are
signed with the repository release key, so either installs over the other and over releases
of this fork that share its package id. This build is its own app
(dev.rushiranpise.rmgnext), so Root My Galaxy is left alone if it is installed - and so
are this app's own settings, history and superuser grant, which start empty here.

Changes since v0.3:

• Merge pull request #4 from rushiranpise/dev
• chore: bump the app version to 0.4
• feat(resukisu): register a manager with the kernel at runtime
• feat(resukisu): make ReSukiSU a selectable flavour
• fix(feed): drop an entry whose flavour this build does not know
• fix(run): derive the payload's post-boot window from the settle this run made
• feat(settings): flag a payload's KernelSU when this boot is not running it
• feat(targets): name the KernelSU each candidate stages, in the payload sheet
• Merge branch 'dev' of https://github.com/rushiranpise/Root-My-Galaxy into dev
• test(manager): hold every payload decision point to recording its KernelSU
• feat(manager): offer the payload's KernelSU version instead of a hardcoded one
• fix(manager): offer KernelSU-Next's own 3.4.0, the release the payload stages
• fix(manager): start a named version's lookup off the calling thread
• fix(root): count a landed load when the payload's control probe fails