Xcode Configuration files: .xcconfigs + Remove xcodegen (#608)

* Create configs files with basic settings populated

* Add Configs and set the global Debug/Release settings

* Update build settings to be read from the configs

* Remove `xcodegen`’s `project.yml`

* Configurable and dynamic bundle and group ids

* Simplified local development with custom Team IDs

Configs/Local.xcconfig.example

@@ -0,0 +1,5 @@
+// Your Apple Developer Team ID - https://stackoverflow.com/a/18727947
+DEVELOPMENT_TEAM = ABC123
+
+// Unique bundle id to be able to register and run locally
+PRODUCT_BUNDLE_IDENTIFIER = chat.bitchat.$(DEVELOPMENT_TEAM)