+ Add support to "podspec" parameter for #452

[camphongdinh]

Add support to "podspec" parameter. If both "podspec" and "path" is present, it will prefer "podspec" over "path" for that specific pod.

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[camphongdinh]

@googlebot I signed it!

[camphongdinh]

@chkuang-g Hi, I have updated the changes:

• Rename "podspec" to "podspecPath" to avoid conflicts if any
• Support http for "podspecPath"

I have built the plugin and tested. It is working fine locally with this format in Dependencies.xml:

<iosPods>
    <iosPod name="IronSourceFyberAdapter" podspecPath="Assets/Plugins/ThirdParties/IronSource/Editor/LocalPod/IronSourceFyberAdapter.podspec.json">
    </iosPod>
  </iosPods>

Still I haven't managed to compile the source into a .tgz for use in Unity Package Manager. I will try again later.

Please let me know if you need any other changes then.

Thanks Phong

[chkuang-g]

@camphongdinh

Thanks for the update. I will take a look today.