Add new DSL GST Element caps property get/set services

[rjhowell44]

New GST Element Services to set and get an Element's property of type caps. See all

• #1234
• #1233

/** 
 * @brief Creates a named GST Caps Object from a named Element's property of 
 * type caps. After the call, the new Caps Object can be queried for its
 * string representation by calling dsl_gst_caps_string_get
 * @param[in] name unique name for the Element to query.
 * @param[in] property unique name of the property to query, typically "caps". 
 * @param[in] caps unique name for the Caps Object to create. The Obejects caps 
 * string can be queried by calling dsl_gst_caps_string_get.
 * @return DSL_RESULT_SUCCESS on success, DSL_RESULT_GST_ELEMENT_RESULT otherwise.
 */
DslReturnType dsl_gst_element_property_caps_get(const wchar_t* name, 
    const wchar_t* property, const wchar_t* caps);
    
/** 
 * @brief Sets a named caps property for a named Element using a GST Caps Object.
 * @param[in] name unique name of the Element to update.
 * @param[in] property unique name of the property to update, typically "caps". 
 * @param[in] caps unique name of the Caps Object to use. 
 * @return DSL_RESULT_SUCCESS on success, DSL_RESULT_GST_ELEMENT_RESULT otherwise.
 */
DslReturnType dsl_gst_element_property_caps_set(const wchar_t* name, 
    const wchar_t* property, const wchar_t* caps);