Remove FIR cpp SDK

• Firebase CPP SDK was removed from the extension, and now the extension uses iOS and Android SDKs directly.
• BREAKING CHANGES in API:
  • Now firebase.remoteconfig uses one callback for all the async event that can be added with firebase.remoteconfig.set_callback()
  • firebase.remoteconfig.init() replaced with firebase.remoteconfig.initialize() and now it's async (the result of operation will be provided in callback, see firebase.remoteconfig.MSG_INITIALIZED)
  • see an example in the Firebase manual https://defold.com/extension-firebase-remoteconfig/

Special thanks to @Sippul79 for doing most of the work.

Upgraded build.gradle for compatibility with Gradle 7.x

FIX: The build.gradle is now compatible with Gradle 7.x and above
CHANGE: The extension uses cocoapods for ios

Updated Firebase SDK

CHANGE: Upgraded Firebase remote config to C++ SDK to 8.10.0 / iOS SDK to 8.13.0. Thanks @dri-richard

Added `get_keys()` function to get the set of all keys

Thanks to @dri-richard for the contribution!

Added set_minimum_fetch_interval(millis)

NEW: Added set_minimum_fetch_interval(millis). Thanks @dri-richard !

Smaller mutex scope

• Use smaller scope for the callback's mutex to avoid possible ANRs/Crashes

Fixed get_string() and get_data() on iOS

Fixed issue with string and data

Fixes #2

Make sure Remote Config is initalized before use

FIX: Check that firebase.remoteconfig.init() has been called before any other function is used

Fixed iOS build error

FIX: Added missing iOS frameworks

First public release

1.0.0

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