fix "Enabled shadow preference shows wrong value"

Over copy-pasted.
update SwipeDismissTouchListener copyright

It was automatically changed by Android Studio.
refactor Settings code

I also want to get rid of those two clones: config preference file /
settings preference file. Hopefully I'll do it someday...
fix "Some notifications' icons are empty"
remove .debug suffix of debug build

No real sense of that, because Android notification listener service doesn't support it. That's sad.
slightly increase the size of status text
refactor notifications handling
replace "Space" in multi-list divider with "No-break space" so it will not be removed by compiler.
style the text of notify's action as a subtext
make dynamic bg option working
update icons
add missing strings
remove unused DebugLayerView
remove unused imports
make [shadow] & [mirrored timeout] options enabled by default
update README.md
increase version
Merge branch 'master' of https://github.com/AChep/AcDisplay