Implement new dsl_source_csi_sensor_id_get/set services to support multiple CSI cameras.

[rjhowell44]

New CSI camera services to get/set the sensor-id

/**
 * @brief Gets the sensor-id setting for the named CSI Source. A unique 
 * sensor-id is assigned to each CSI Source on creation, starting with 0. The 
 * default setting can be overridden by calling dsl_source_decode_uri_set. The 
 * call will fail if the given sensor-id is not unique. If a source is deleted, 
 * the sensor-id will be re-assigned to a new CSI Source if one is created.
 * @param[in] name unique name of the CSI Source to query.
 * @param[out] sensor_id current sensor-id setting. Default: 0.
 * @return DSL_RESULT_SUCCESS on success, DSL_RESULT_SOURCE_RESULT otherwise.
 */
DslReturnType dsl_source_csi_sensor_id_get(const wchar_t* name,
    uint* sensor_id);
    
/**
 * @brief Sets the sensor-id setting for the named CSI Source. A unique 
 * sensor-id is assigned to each CSI Source on creation, starting with 0. This 
 * service will fail if the given sensor-id is not unique. If a source is deleted, 
 * the sensor-id will be re-assigned to a new CSI Source if one is created.
 * @param[in] name unique name of the CSI Source to update.
 * @param[in] sensor_id new sensor-id setting to use.
 * @return DSL_RESULT_SUCCESS on success, DSL_RESULT_SOURCE_RESULT otherwise.
 */
DslReturnType dsl_source_csi_sensor_id_set(const wchar_t* name,
    uint sensor_id);

[rjhowell44]

Merged into v0.26.alpha