ARA Client: Add CMake support for creating plugins

docs/CMake API.md

@@ -599,6 +599,40 @@ attributes directly to these creation functions, rather than adding them later.
   Unlike the other `COPY_DIR` arguments, this argument does not have a default value so be sure
   to set it if you have enabled `COPY_PLUGIN_AFTER_BUILD` and the `Unity` format.
 
+`IS_ARA_EFFECT`
+- May be either TRUE or FALSE (defaults to FALSE). If TRUE it enables additional codepaths in the
+  VST3 and AU plugin wrappers allowing compatible hosts to load the plugin with additional ARA
+  functionality. It will also add the preprocessor definition `JucePlugin_Enable_ARA=1`, which can
+  be used in preprocessor conditions inside the plugin code. You should not add this definition
+  using `target_compile_definitions` manually.
+
+`ARA_FACTORY_ID`
+- A globally unique and versioned identifier string. If not provided a sensible default will be
+  generated using the `BUNDLE_ID` and `VERSION` values. The version must be updated if e.g. the
+  plugin's (compatible) document archive ID(s) or its analysis or playback transformation
+  capabilities change.
+
+`ARA_DOCUMENT_ARCHIVE_ID`
+- Identifier string for document archives created by the document controller. This ID must be
+  globally unique and is shared only amongst document controllers that create the same archives and
+  produce the same render results based upon the same input data. This means that the ID must be
+  updated if the archive format changes in any way that is no longer downwards compatible. If not
+  provided a version independent default will be created that is only appropriate as long as the
+  format remains unchanged.
+
+`ARA_ANALYSIS_TYPES`
+- Defaults to having no analyzable types. Should be one or more of the following values if the
+  document controller has the corresponding analysis capability: `kARAContentTypeNotes`,
+  `kARAContentTypeTempoEntries`, `kARAContentTypeBarSignatures`, `kARAContentTypeStaticTuning `,
+  `kARAContentTypeKeySignatures`, `kARAContentTypeSheetChords`
+
+`ARA_TRANSFORMATION_FLAGS`
+- Defaults to `kARAPlaybackTransformationNoChanges`. If the document controller has the ability to
+  provide the corresponding change it should be one or more of:
+  `kARAPlaybackTransformationTimestretch`, `kARAPlaybackTransformationTimestretchReflectingTempo`,
+  `kARAPlaybackTransformationContentBasedFadeAtTail`,
+  `kARAPlaybackTransformationContentBasedFadeAtHead`
+
 #### `juce_add_binary_data`
 
     juce_add_binary_data(<name>