implemented Xcode license check for `pod setup`

Copy Swift libraries using `rsync -u`

This should ensure that they're not recopied if unchanged, because the
destination will be newer if they changed due to code-signing.

[Installer] Reject installation if a static library is used as a transit...

[Installer] Reject installation if a static library is used as a transitive dependency while integrating Pods as frameworks.

Configure as extension only for watch extensions

[Frameworks] Fail lint for Swift on iOS < 8.

Since we now have our own error for this, it should be filtered,
especially considering that it might be confusing for people linting
with `--use-frameworks`.

Have to use dynamic frameworks for Swift and they are unsupported on iOS
7.

Closes https://github.com/CocoaPods/CocoaPods/issues/3158.

Closes #3134

No colors when grepping.

Use proper TMPDIR instead of /tmp

Add .tpp header support

Sync main master with czechboy0 master