iOS bindings

[kaloudis]

This PR includes the iOS bindings for lnc-rn and update to the scaffolding of the demo apps.

Git LFS has been added to handle the iOS binaries for LNC mobile

[jamaljsr]

I got the connect-demo working in the iOS simulator with the following changes. I suggest updating this PR with these changes before merging.

It would also be really great to provide instructions on what commands to use to run the demo apps as I had to fumble my way through it.

1. Replaced @import Foundation with #import <Foundation/Foundation.h> in Mobile.objc.h and Universe.objc.h to resolve the build error

/lnc-rn/ios/Lndmobile.xcframework/ios-arm64/Lndmobile.framework/Headers/Universe.objc.h:9:1: error: use of '@import' when C++ modules are disabled, consider using -fmodules and -fcxx-modules

2. Ran the following commands to install the lnc-rn package using a relative path in package.json

cd demos/connect-demo
npm uninstall @lightninglabs/lnc-rn
npm install ../..

3. Updated the demos/connect-demo/metro.config.js to remove the hard-coded path

const path = require('path');
const { getDefaultConfig } = require('metro-config');

module.exports = (async () => {
  const {
    resolver: { sourceExts, assetExts }
  } = await getDefaultConfig();
  return {
    watchFolders: [
      path.resolve(path.join(__dirname, '..', '..'))
    ],
    resolver: {
      assetExts: assetExts.filter(ext => ext !== 'svg'),
      sourceExts: [...sourceExts, 'svg']
    }
  };
})();

[kaloudis]

@jamaljsr 2+3 should be resolved when we publish the package and update the demo apps to point to the version on npm

For 1, I think we should fix the import before uploading the library files on GitHub. For those who want to build the libraries from scratch, we can include that step in the Install instructions. Working on some updates over at #9

[jamaljsr]

@jamaljsr 2+3 should be resolved when we publish the package and update the demo apps to point to the version on npm

Ok, but it would make my life easier when switching branches to review PRs 😊. If you don't expect there to be any more PRs before release, then it's fine to leave it as is.

For 1, I think we should fix the import before uploading the library files on GitHub. For those who want to build the libraries from scratch, we can include that step in the Install instructions. Working on some updates over at #9

Is this something that will always be necessary? If so, it makes sense to automate the string replacement via a make/bash script when running make ios.

[kaloudis]

Automated the iOS string replacement here: lightninglabs/lightning-node-connect#63