Reinhold Gschweicher dfbc345511 main: implement saveScreenshot() writing bmp/png from SDL window buffer ...

When pressing `i` create a screenshot of the current InfiniTime screen
by dumping it to a timestamped png or bmp file like
`InfiniSim_2022-03-08_203421.png`.

Add a new configure option `WITH_PNG` with default `ON`. When switched
to `OFF` the screenshots will be created in `bmp` format.

Fixes: https://github.com/InfiniTimeOrg/InfiniSim/issues/5

2022-03-08 21:39:16 +01:00

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