implemented native share intent support for android and ios with chat and folder pickers

ios/Share Extension/Share Extension.entitlements

@@ -0,0 +1,10 @@
+<?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.application-groups</key>
+	<array>
+		<string>group.eu.mhsl.marianum.mobile.client.share</string>
+	</array>
+</dict>
+</plist>