so it doesn't have to be manually specified

requires SDL2.framework @ version 2.23+

you may build using cmake -DSDL2_DIR=/Library/Frameworks/SDL2.framework ..
to force cmake to select the framework over another SDL install (eg brew install sdl2)

fixes #1329

the icon we generate doesnt work well on iOS/macOS
its also unexpected for the icon to change when running the app
this will allow macOS to keep the bundle icon (artwork/gemrb.icns)

also fixes the build for anyone else not defining BAKE_ICON

sadly cmake tries the MODULE version first, not CONFIG

we check twice, so it doesn't matter in practice

instead of a custom search module, which hopefully also fixes mac issue #1329

we were hardcoding PLUGIN_DIR and DATA_DIR, which we do not want on macOS or iOS

resolves #1580

REQUIRED will fatally error itself

untested and appveyor won't try it either

thanks traveler!

Especially MSVC did not like anything of how we did it so far.

We currently don't have any semi builds, and the plugins are incomplete,
leading to some linker errors right now.

should remove fmt spam on buildbots

Python 3 already implicitly converts strings to unicode so we already have a need to convert from unicode
this is already the case and we are just broken anytime we don't have iconv because ConvertCharEncoding is just strduping the bad string

we want to be able to have utf-16 for all internal strings (see #1516)

it's been seven years; anyone that still needs it can pass it themselves

eg. -DSANITIZE=address

still prefers py2 if both are available

perhaps related to #1280