Switch xcode support to module map approach

xcode/genXCModule.zsh

@@ -0,0 +1,26 @@
+#!/usr/bin/env zsh
+# TODO Support iOS simulator
+
+# setup working dirs w/modulemap
+rm -rf ./build
+mkdir -p ./build/{ios,macos}
+echo "module cmutton {
+    header "cmutton.h"
+    link "cmutton"
+    export *
+}" > ./build/{ios,macos}/module.modulemap
+
+# cd to Go source
+cd ..
+
+# build static archive for all platforms
+## iOS
+CGO_ENABLED=1 GOOS=ios SDK=iphoneos go build -buildmode=c-archive
+mv ./{cmutton.a,cmutton.h} ./xcode/build/ios/
+cp ./types.h ./xcode/build/ios/
+## macOS
+CGO_ENABLED=1 GOOS=darwin go build -buildmode=c-archive
+mv ./{cmutton.a,cmutton.h} ./xcode/build/macos/
+cp ./types.h ./xcode/build/macos/
+
+cd ./xcode