[jtx] Add builders for categories, comments, resources

[cketti]

Old code:

synctools/lib/src/main/kotlin/at/bitfire/ical4android/JtxICalObject.kt

Lines 474 to 499 in f5e0f50

	is Categories ->
	for (category in prop.categories.texts)
	iCalObject.categories.add(Category(text = category))
	is net.fortuna.ical4j.model.property.Comment -> {
	iCalObject.comments.add(
	Comment().apply {
	this.text = prop.value
	this.language = prop.getParameter<Language>(Parameter.LANGUAGE)?.getOrNull()?.value
	this.altrep = prop.getParameter<AltRep>(Parameter.ALTREP)?.getOrNull()?.value
	// remove the known parameter
	prop.removeAll<Property>(
	Parameter.LANGUAGE,
	Parameter.ALTREP
	)
	// save unknown parameters in the other field
	this.other = JtxContract.getJsonStringFromXParameters(prop.parameterList)
	})
	}
	is Resources ->
	for (resource in prop.resources.texts)
	iCalObject.resources.add(Resource(text = resource))

and

synctools/lib/src/main/kotlin/at/bitfire/ical4android/JtxICalObject.kt

Lines 1237 to 1266 in f5e0f50

	this.categories.forEach { category ->
	insertBatch += BatchOperation.CpoBuilder
	.newInsert(JtxContract.JtxCategory.CONTENT_URI.asSyncAdapter(collection.account))
	.withValue(JtxContract.JtxCategory.ICALOBJECT_ID, id)
	.withValue(JtxContract.JtxCategory.TEXT, category.text)
	.withValue(JtxContract.JtxCategory.ID, category.categoryId)
	.withValue(JtxContract.JtxCategory.LANGUAGE, category.language)
	.withValue(JtxContract.JtxCategory.OTHER, category.other)
	}
	this.comments.forEach { comment ->
	insertBatch += BatchOperation.CpoBuilder
	.newInsert(JtxContract.JtxComment.CONTENT_URI.asSyncAdapter(collection.account))
	.withValue(JtxContract.JtxComment.ICALOBJECT_ID, id)
	.withValue(JtxContract.JtxComment.ID, comment.commentId)
	.withValue(JtxContract.JtxComment.TEXT, comment.text)
	.withValue(JtxContract.JtxComment.LANGUAGE, comment.language)
	.withValue(JtxContract.JtxComment.OTHER, comment.other)
	}
	this.resources.forEach { resource ->
	insertBatch += BatchOperation.CpoBuilder
	.newInsert(JtxContract.JtxResource.CONTENT_URI.asSyncAdapter(collection.account))
	.withValue(JtxContract.JtxResource.ICALOBJECT_ID, id)
	.withValue(JtxContract.JtxResource.ID, resource.resourceId)
	.withValue(JtxContract.JtxResource.TEXT, resource.text)
	.withValue(JtxContract.JtxResource.LANGUAGE, resource.language)
	.withValue(JtxContract.JtxResource.OTHER, resource.other)
	}