Configure diagnostics (and MapLibre) using Pkl. (#3820)

* Bump the version for the next release.

* Ignore all generated sources.

* Use Pkl+XcodeGen to inject secrets instead of the project.

* Inject the PostHog/Sentry/Rageshake configuration from the environment.

* Fix bad unicode.

* Fix unit tests.

ElementX/SupportingFiles/Info.plist

@@ -117,8 +117,6 @@
 	<string>$(BASE_BUNDLE_IDENTIFIER)</string>
 	<key>keychainAccessGroupIdentifier</key>
 	<string>$(KEYCHAIN_ACCESS_GROUP_IDENTIFIER)</string>
-	<key>mapLibreAPIKey</key>
-	<string>$(MAPLIBRE_API_KEY)</string>
 	<key>productionAppName</key>
 	<string>$(PRODUCTION_APP_NAME)</string>
 </dict>

ElementX/SupportingFiles/secrets.xcconfig

@@ -1,21 +0,0 @@
-//
-// Copyright 2023 New Vector Ltd
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-//
-
-// Configuration settings file format documentation can be found at:
-// https://help.apple.com/xcode/#/dev745c5c974
-
-// MARK: - MapLibre
-MAPLIBRE_API_KEY = your_key

ElementX/SupportingFiles/target.yml

@@ -42,10 +42,6 @@ targets:
     type: application
     platform: iOS
 
-    configFiles:
-      Debug: ../SupportingFiles/secrets.xcconfig
-      Release: ../SupportingFiles/secrets.xcconfig
-
     info:
       path: ../SupportingFiles/Info.plist
       properties:
@@ -109,8 +105,6 @@ targets:
           LSHandlerRank: Owner
           LSItemContentTypes: $(PILLS_UT_TYPE_IDENTIFIER)
         LSSupportsOpeningDocumentsInPlace: false
-        mapLibreAPIKey: $(MAPLIBRE_API_KEY)
-
 
     settings:
       base:
@@ -226,6 +220,7 @@ targets:
       excludes:
         - Other/Extensions/XCTestCase.swift
         - Other/Extensions/XCUIElement.swift
+    - path: ../../Secrets/Secrets.swift
     - path: ../Resources
     - path: ../SupportingFiles
     - path: ../../Tools/Scripts/Templates/SimpleScreenExample/ElementX