Android: Add support for switching display modes (resolution and refresh rate)

[mark-kendall]

I had this working some time ago but lost the code with a disk failure:)

[mark-kendall]

Found a backup :)

WIP patch for MythDisplayAndroid

https://gist.github.com/mark-kendall/f4f9a1725290eab7463fafd88319cb55

and associated java file:

https://gist.github.com/mark-kendall/8451f3500546105506144a9de7c74a5a

There is some debugging in the patches and from memory there is an issue with the threading with the java implementation - such that we cannot wait for the result to be confirmed.

[bennettpeter]

FWIW I have display refresh rate switching working in leanfront, and associated java code for that. I decided there was no point in display resolution switching. Switching to a low resolution for a standard def recording would result in poor display of OSD and I don't think there is any visible improvement. Let me know if you would like me to locate the java code for you.