Add AppCode support (fixes #147, #49)

[yeswolf]

This PR is a result of 1.8 review after this conversation. Finally I found that we still need to build the application in Xcode, so I've decided to implement a patch to correctly identify AppCode version. Some random notes:

1. AppCode < 2020.1 uses ~/Library/Caches/AppCode<major>.<minor> for storing out custom DerivedData
2. AppCode >= 2020.1 uses ~/Library/Caches/JetBrains/AppCode<major>.<minor> for storing out custom DerivedData
3. idea.path.selector is used to identify the cache directory with DerivedData. If nothing is found for the current release, we use previous release version.
4. If nothing is found after all, we default to Xcode DerivedData.
5. If some another editor is used that is not AppCode - we think it's Xcode and use Xcode's DerivedData.

Tested - works starting with AppCode 2019.3, works simultaneously in Xcode, AppCode 2020.1, AppCode 2019.3 and any other editor.

[johnno1962]

Thank you very much @yeswolf! This is a very worthwhile contribution. I’ve checked it out and it seems to work fine this end. @zenangst can you review/check it works please and I can merge.

[johnno1962]

LVGTM

[zenangst]

Looks great, let's merge this bad boy!

[yeswolf]

@johnno1962, @zenangst Thank you so much! Do you think it's possible to build 1.8 RC2 with these changes? We plan to publish a tutorial about using AppCode together with Injection, and it would be really great to have a direct link for a new version that removes the need to rebuild in Xcode (looks strange for users).

[zenangst]

I'll see what I can do! :)

[yeswolf]

@zenangst Thank you!

[zenangst]

Hey @yeswolf, a new version is ready and available for download here - https://github.com/johnno1962/InjectionIII/releases/tag/1.8rc2

[johnno1962]

Hi @zenangst, you’re not tempted to push out the new version to the AppStore? Fine by me.

[zenangst]

@johnno1962 yeah I think we should!

[johnno1962]

Already out in the Store, thanks @zenangst 👍 👍

[yeswolf]

@zenangst @johnno1962 Thank you so much!