Implement shader-based water ripples

Andrei Kortunovrequested to merge
akortunov/openmw:ripples into master

Implements feature #3537 (closed).

Based on MR !2641 (closed), since @glassmancody.info does not have a time to finish it and asked someone else to do it.

This MR is basically 2641 migrated to modern OpenMW codebase and with presumably fixed types mismatch on Android.

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