Fixed: Remove explicit use of Mac OS X 10.5 SDK, replace with "latest OS X"

The fontinfo and imagesize Xcode projects still explicitly refer to using the Mac OS X 10.5 SDK, while all other Xcode projects simply refer to the latest Mac OS X SDK, with no explicit OS version. This change modifies these two projects to mirror other Xcode projects in the project.

Fixes #1957
FIXED: Crash when using setContentSize: on a popover that is not shown.
FIXED: popverWillShow was called to early and contentSize was returning 0,0 if popover was hidden
FIXED: updateFrameWithSize: was always assuming the popver was open
Merge pull request #1958 from GlennAustin/gla/NoOSX10.5

Fixed: Remove explicit use of Mac OS X 10.5 SDK, replace with "latest OS X"
Merge remote-tracking branch 'origin' into xCodeCappUpdatingCapp
Fixed: type in preferences for the update of cappuccino
Fixed: xCodeCapp documentation is outdated

Fixes #2114
Fixed: udpate file help.pages