Make compilation on macOS more clear

[Metal-Snake]

I added information on how to compile on mac in the readme.md, also I removed the scripts setup/macosx/create_app.sh and create_package.sh and renamed create_app_new.sh to create_app.sh

If those scripts are still needed let me now what those are for (they didn't work on my machine) and I will update accordingly.

[PeterDaveHello]

Please squash e36eada into 45a5961, they should not be separated.

Instead of adding the notes about fpc and lazarus can't work from Homebrew, I personally more prefer to solve the issue in fact.

[PeterDaveHello]

brew should be Homebrew

[PeterDaveHello]

This instruction should be more precise and separate the step to prepare environment and to compile.

[Metal-Snake]

I updated the ReadMe.md
Is this ok now?

I agree, fixing the build using brew's fpc/lazarus should be done. That's why I wrote Currently it can't be done with those.
But that means checking what's going on, compare both installs. I would do this using VirtualMachines and compare those. But my current machine is too weak, I hope for a new iMac this year, if that gets released I buy one and then I will look into it. For the time being it's better to explain it than to be silent about it.

How would I squash 2 commits together?

[PeterDaveHello]

@Diskutant yeah I agree to have that message right now, will take a look soon, thanks.