Extract HTMLParser in dedicated library (#1412)

Fixes https://linear.app/a8c/issue/AINFRA-639

The code is already in use in the WooCommerce iOS watchOS app, see
woocommerce/woocommerce-ios@ec7a641

I decide to extract the files under the standard `Sources/` and `Tests/`
root folders that SwiftPM expects. To keep the `Package.swift` and
`podspec`s consistent, I moved all the other sources and tests there,
too.

I updated the plumbing in the example app and ran it locally to ensure
it still works, for what is worth.

<img alt="Screenshot 2025-06-04 at 8 12 01 AM"
src="https://github.com/user-attachments/assets/c7f8fdd2-134c-4f47-9d41-aac895c12c1e"
width=300/>


---

- [x] I have considered if this change warrants release notes and have
added them to the appropriate section in the `CHANGELOG.md` if
necessary. – N.A. many files were moved, but the source change was
minimal.

Author: mokagio

.buildkite/shared-pipeline-vars

@@ -5,7 +5,7 @@
 
 # The ~> modifier is not currently used, but we check for it just in case
 XCODE_VERSION=$(sed -E 's/^~> ?//' .xcode-version)
-CI_TOOLKIT_PLUGIN_VERSION="3.8.0"
+CI_TOOLKIT_PLUGIN_VERSION="5.3.1"
 
-export IMAGE_ID="xcode-$XCODE_VERSION-macos-14.7.1-v1"
+export IMAGE_ID="xcode-$XCODE_VERSION"
 export CI_TOOLKIT_PLUGIN="automattic/a8c-ci-toolkit#$CI_TOOLKIT_PLUGIN_VERSION"

.editorconfig

@@ -0,0 +1,24 @@
+root = true
+
+# Apply to all files
+[*]
+indent_style = space
+indent_size = 2
+end_of_line = lf
+insert_final_newline = true
+charset = utf-8
+trim_trailing_whitespace = true
+
+[*.md]
+trim_trailing_whitespace = false
+
+[*.swift]
+indent_size = 4
+
+[{*.h,*.m}]
+indent_size = 4
+
+# Ruby specific rules
+[{*.rb,Fastfile,Gemfile}]
+indent_style = space
+indent_size = 2

.rubocop.yml

@@ -2,6 +2,11 @@
 AllCops:
   NewCops: enable
 
+Metrics/BlockLength:
+  Exclude:
+    - 'WordPress-Aztec-iOS.podspec'
+    - 'WordPress-Editor-iOS.podspec'
+
 # Allow the Podspec filename to match the project
 Naming/FileName:
   Exclude:

.swiftpm/xcode/xcshareddata/xcschemes/Aztec.xcscheme

@@ -26,8 +26,13 @@
       buildConfiguration = "Debug"
       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
-      shouldUseLaunchSchemeArgsEnv = "YES"
-      shouldAutocreateTestPlan = "YES">
+      shouldUseLaunchSchemeArgsEnv = "YES">
+      <TestPlans>
+         <TestPlanReference
+            reference = "container:Tests/AztecTests/Aztec.xctestplan"
+            default = "YES">
+         </TestPlanReference>
+      </TestPlans>
    </TestAction>
    <LaunchAction
       buildConfiguration = "Debug"

.swiftpm/xcode/xcshareddata/xcschemes/WordPress-AztecEditor-iOS-Package.xcscheme

@@ -62,6 +62,20 @@
                ReferencedContainer = "container:">
             </BuildableReference>
          </BuildActionEntry>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "YES"
+            buildForProfiling = "YES"
+            buildForArchiving = "YES"
+            buildForAnalyzing = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "HTMLParser"
+               BuildableName = "HTMLParser"
+               BlueprintName = "HTMLParser"
+               ReferencedContainer = "container:">
+            </BuildableReference>
+         </BuildActionEntry>
       </BuildActionEntries>
    </BuildAction>
    <TestAction
@@ -91,6 +105,16 @@
                ReferencedContainer = "container:">
             </BuildableReference>
          </TestableReference>
+         <TestableReference
+            skipped = "NO">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "HTMLParserTests"
+               BuildableName = "HTMLParserTests"
+               BlueprintName = "HTMLParserTests"
+               ReferencedContainer = "container:">
+            </BuildableReference>
+         </TestableReference>
       </Testables>
    </TestAction>
    <LaunchAction

.xcode-version

@@ -1 +1 @@
-16.2
+16.4