Update version of Gradle plugin and libraries

Set Android compile version as 36

Run build with KSP

Fix full screen view of Principal Activity

Fix full screen view of Settings Activity

• We really need to go over theming ---

Introduce gradient in the toolbars, try applying the same to About

Fix layout activity

Add insets utilites in GeneralActivity, fix Backup activity

Fix insets in Intro Activity too

Fixes T1293

From Fairphone 5:

• open app
• 1254: see results
• long press change source: still see results
• rotate screen: see results
• click favorites 10 times: still no crash
• favorites, tap: still see results

Map:

• still see results and realtime stuff
• tap on bus stop: stil see results

Lines:

• tap on line (e.g. 2): still see line
• still see realtime buses
• change direction: it works
• view line as list: it works

Settings:

• change map style to raster: it works