app

- android studio 3.1.4 -> 3.2.0 yay
- buildTools 28.0.2 -> 28.0.3
- finally a stable 28 library; 28.0.0
- removed acastus because, quote, "Acastus was moved to the archive because the service it relies on has shut down." (will preserve deleted xmls and svgs from now on in "removed")
- fixed some english in README.md, found the [source](https://hike.in/images/hike5.0/apk.png) of the "download apk" image (literally a [singular source](https://www.google.com/search?q=circle&tbm=isch&tbs=simg:CAQSlwEJp6GzSFSZlf4aiwELEKjU2AQaBAgVCAoMCxCwjKcIGmIKYAgDEiibCoUDmhSBCvoGggqnE5sUoAqxFJk9lz2YPbE9lj2zPZg3mzSyPaA9GjCM6UrpBbzL0s24_1QhkZ45iiOiV8t-up23b_1EIQGMpUlKZAdxL4-D6Go9PzoIuNAv0gBAwLEI6u_1ggaCgoICAESBIdEHOEM&sa=X&ved=0ahUKEwijzuCfwObdAhVLVK0KHR-GBGgQ2A4IKygB&biw=1366&bih=577#imgrc=rnbxo0O8BRsYcM:); it doesn't exist anywhere else on the indexable internet https://hike.in/images/hike5.0/apk.png

)
- removed a bunch of weird-ass spaces in the .sh files, don't think it will affect anything
- deleted old "Get-it-on-F-Droid.svg.png" that for some reason i havent deleted yet, probably because i didnt notice it

Signed-off-by: TacoTheDank <SkytkRSfan3895@gmail.com>