Add framework support for CocoaPods

[cuva]

Currently Spectrum cannot be integrated via Cocoapods if the podfile defines !use_frameworks! - as surfaced in #23.

As Swift libraries can now be added as static libraries, !use_frameworks should be less and less used - but it'd be nice to support it nontheless.

[rohitphogat19]

When use_frameworks will be available for Spectrum?

[cuva]

Hi @rohitphogat19. I currently don't have the bandwidth to work on this task as I'm focussing on getting #26 fixed first. I'd be more than happy to accept a PR though if someone is keen to look into it.

[scutletbutt]

Hi @rohitphogat19, once #26 is fixed, in cocoapod you could use use_modular_headers instead of use_framework to use spectrum

[oskarko]

Hi team! Now #26 is fixed, any update about use_frameworks!?

[juliocbcotta]

So, no advancements in this? I am really eager to be able to try it in my flutter plugin. :-/

[jangsy7883]

use_frameworks! Is there a way to use spectrum while using?

[coolpolus]

Hi team,

Thanks for the great library! Any update or plans about use_frameworks!?