[Feature] support idiom for icon

[yyjim]

Description

Support export icons with ~idiom suffix.

This PR include change in #38

Changes

• Update ImagePack type to struct.
• Add Scale enum
  • all: for all device
  • individual: fix scale value
• Update exportAndroidSVGImages and exportAndroidRasterImages
• Update XcodeIconsExporter and XcodeImagesExporter
• Add extension functions to create [FileContents] for exporting to Xcode.
• Update test cases
• Updated Examples/Example assets

[subdan]

This PR breaks color and icon exporting.

1. When I try to export ic/24/profile~ipad icon, FigmaExport terminates with the following error: Error: Bad asset name «ic_24_profile~ipad»

2. When I try to export colors to Xcode, FigmaExport terminates with the following error: error: Unable to add some file references to Xcode project

[subdan]

Sorry, I've checked wrong branch.

[subdan]

Return "@" symbol when exporting images to Xcode project.

[subdan]

I've run figma-export images for iOS example project and the result is wrong.

Look at the exclamation marks.

[yyjim]

ok, Thanks for review it. I'll resolve the conflicts and fix the issue soon.

[yyjim]

Hi @subdan The issues are resolved, please review it when you have time. Thanks.

[subdan]

Thanks. I will make review tomorrow.

[yyjim]

Hi @subdan Please check the last commit for updating the TemplateProperties.

[subdan]

Thanks for the PR, Jim! I published a new release with your changes.