getParamMetaValue(key, params, meta) {
		if (key.startsWith("#") && meta != null) return _.get(meta, key.slice(1));
		else if (params != null) return _.get(params, key);
	}
Get a value from params or meta by `key`.
If the key starts with `#` it reads from `meta`, otherwise from `params`.

@param {String} key
@param {Object} params
@param {Object} meta
@returns {any}
@memberof Cacher