Release v0.7

Version: 0.7
Commit: 7810994

Two APKs: RootMyGalaxyNext-0.7.apk is the release build, and
RootMyGalaxyNext-0.7-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 v0.6:

• Update app version base from 0.6 to 0.7
• Merge pull request #16 from rushiranpise/dev
• refactor(dfr): drop DFReroot's unused per-step entry points
• feat(history): clear every run from one button
• fix(app): take the screen when a universal run starts
• feat(root): re-port the chain to DFRoot's insmod and LKM design