make ios-deploy optional?

[ruisalgado]

building ios-deploy is riddled with issues in MacOS Catalina, from requiring --unsafe-perm=true to issues linking to xcode libraries during the build step. Its maintainers now recommend installing a pre-compiled binary via brew.
The current maji setup has the installation of ios-deploy and ios-sim
be triggered by a cordova hook, which means they get installed even if you're never going to use them (you wouldn't need them for example in a CI environment).
A better (?) approach could be to try to resolve these dependencies only when they are need (when running certain maji cli commands). At this point we might offer to install ios-deploy via brew as an alternative to npm, or at least educate the user about it.

[pascalw]

Yeah ios-deploy has always been a PITA, but I didn't realize it had gotten even worse on Catalina.

I'm in favor of removing the code that installs the module automatically and just putting it as a prerequisite in the docs. WDYT?

[ruisalgado]

sounds good to me