PRC Table 144 ColorData undefined data type of Color

[mvrhel]

Table 144 ColorData includes an object of first_vertex which is of DataType Color. This data type is not defined. From the data description it sounds like it is encoded as uint8_t for each colorant (and possibly alpha) value -- and I verified that this is the case. The issue is that the only place that I can find in the file where color values are defined is in Table 46 which is a table of 3 doubles and is really DataType RgbColor not Color. So I think we either need to add the new DataType or clarify everywhere that Color is used that it is 8bit per channel color data.