iOS support

[joliver82]

• Added jme3-ios-native library mostly based on old native iOS code prepared to work with both MOE and RoboVM (robovm is still WIP)
• Modified jme3-ios adding buffer allocator and proper getPlatform method

Pending to add jme3-ios-native library to be uploaded to maven. Any help is appreciated

[codex128]

You should probably write at least one test for this.

[stephengold]

Pending to add jme3-ios-native library to be uploaded to maven. Any help is appreciated

If gradlew install installs the library to your Maven Local repository, then I expect gradlew release will upload it to the correct staging repo.

[joliver82]

Thanks for the comments

@codex128 , OK, I would write some, but... Which kind of tests do you want me to do? Also, how could I make them run either when compiling locally or in github actions if this code is intended to run only on iOS?

@stephengold , checked and the artifact is saved properly to mavenLocal. I had to make a small change so the jar is properly created when running "gradlew install". Thanks for the tip

[codex128]

Huge thanks for this PR, and I apologize that it didn't get better attention sooner. Just a few things I noticed that need changing.

[codex128]

Looks good, thanks @joliver82

@yaRnMcDonuts this is ready whenever you are