[SpecWithSource] Rename #spec_source for consistency with LazySpecification

Change colorscheme of `pod outdated` from red-yellow-green to red-blue-green

This is an improvement for colorblind users who can not differentiate between green and yellow.
Refs #7372

Preserve external sources on locked dependencies in the resolver

[Bundle] Update Xcodeproj

nowhere is one word

(Not so) Small performance improvements

Add set -u to frameworks and resources copy scripts

This way, CocoaPods does not have to make assumptions about when to copy things, as the user can then set FRAMEWORKS_FOLDER_PATH / UNLOCALIZED_RESOURCES_FOLDER_PATH for static library targets

This is an optional variable

This variable isn't set by Xcode when running this script.

This case statement handles different iOS device families, for macOS
builds this build setting isn't set.

Turns out that bash arrays are not initialized until they have a single
item. This means this variable is treated as unbound until we add an
item to it. By defaulting this to nothing, this check succeeds even if
no items are ever added to the array.