Add hardened runtime entitlements to allow AppleScript + scripting lang

Use get-task-allow which seems to be necessary to get scripting
languages like Python to work. It's discouraged in docs, but from trials
seems like App Notarization will give a warning but still approve the
app.

Author: ychin

src/MacVim/MacVim.entitlements

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+    <key>com.apple.security.automation.apple-events</key>
+    <true/>
+    <key>com.apple.security.cs.disable-library-validation</key>
+    <true/>
+    <key>com.apple.security.get-task-allow</key>
+    <true/>
+</dict>
+</plist>