CordovaLib.xcodeproj file upgraded for Xcode 10

[dpogue]

Platforms affected

iOS

What does this PR do?

Upgrades CordovaLib.xcodeproj to Xcode 10 standards

What testing has been done on this change?

All the objc unit tests pass locally with Xcode 10.1, opening this PR to see how they are handled by Xcode 9.

[codecov-io]

Codecov Report

Merging #489 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #489   +/-   ##
=======================================
  Coverage   74.75%   74.75%           
=======================================
  Files          11       11           
  Lines        1822     1822           
=======================================
  Hits         1362     1362           
  Misses        460      460

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[shazron]

Looks like the TravisCI tests all pass with Xcode 9. However, we don't seem to have Xcode 10 TravisCI tests in the matrix

[dpogue]

@shazron I've reduced this back to just the CordovaLib.xcodeproj and CordovaLib deprecation changes, and added Xcode 10.1 to the CI matrix on Travis (while keeping a single run of Xcode 9.3 as a backward-compatibility check, pending further discussion)

[erisu]

LGTM