Templates install script doesn't account for relative paths

[pschuette22]

Migrate Templates install script to IDE plugin with injected destinations.

[pschuette22]

Temporary workaround

Locate the checkout by left clicking async state package in xcode and revealing in finder. Refer to this as {checkout-path}.

mkdir -p /Users/pschuette/Library/Developer/Xcode/Templates/Async\ State
cp -r {checkout-path}/xctemplates ~/Library/Developer/Xcode/Templates/Async\ State/