Add missing build setting info to backstop dictionary

- Add missing info for deployment version settings for iOS, tvOS, watchOS
- Add missing info for 'combine HiDPI images' setting on macOS
- Closes #23

Author: dempseyatgithub

BuildSettingExtractor/BuildSettingInfoSubpaths.plist

@@ -4,10 +4,26 @@
 <dict>
 	<key>backstopSettingInfo</key>
 	<dict>
-		<key>[SWIFT_OPTIMIZATION_LEVEL]-description</key>
-		<string>None [-Onone], Fastest [-O], Fastest, Unchecked [-Ounchecked]</string>
 		<key>[SWIFT_OPTIMIZATION_LEVEL]-name</key>
 		<string>Swift Optimization Level</string>
+		<key>[SWIFT_OPTIMIZATION_LEVEL]-description</key>
+		<string>None [-Onone], Fastest [-O], Fastest, Unchecked [-Ounchecked]</string>
+		<key>[IPHONEOS_DEPLOYMENT_TARGET]-name</key>
+		<string>iOS Deployment Target</string>
+		<key>[IPHONEOS_DEPLOYMENT_TARGET]-description</key>
+		<string>Code will load on this and later versions of iOS. Framework APIs that are unavailable in earlier versions will be weak-linked; your code should check for null function pointers or specific system versions before calling newer APIs.</string>
+		<key>[TVOS_DEPLOYMENT_TARGET]-name</key>
+		<string>tvOS Deployment Target</string>
+		<key>[TVOS_DEPLOYMENT_TARGET]-description</key>
+		<string>Code will load on this and later versions of tvOS. Framework APIs that are unavailable in earlier versions will be weak-linked; your code should check for null function pointers or specific system versions before calling newer APIs.</string>
+		<key>[WATCHOS_DEPLOYMENT_TARGET]-name</key>
+		<string>watchOS Deployment Target</string>
+		<key>[WATCHOS_DEPLOYMENT_TARGET]-description</key>
+		<string>Code will load on this and later versions of watchOS. Framework APIs that are unavailable in earlier versions will be weak-linked; your code should check for null function pointers or specific system versions before calling newer APIs.</string>
+		<key>[COMBINE_HIDPI_IMAGES]-name</key>
+		<string>Combine HiDPI Images</string>
+		<key>[COMBINE_HIDPI_IMAGES]-description</key>
+		<string>Combines image files at different resolutions into one multi-page TIFF file that is HiDPI compliant for macOS 10.7 and later. Only image files in the same directory and with the same base name and extension are combined. The file names must conform to the naming convention used in HiDPI.</string>
 	</dict>
 	<key>subpaths</key>
 	<array>