59.2.38.5 Script Strings for Non-ETX and STMAN Preview

A script string named "Preview bitmap" is created and assigned to the "Fixed logo" generator and "CG/Crawl" logo generator for performing a preview with the logo on the following objects:
1. Non-ETX graphics as a static logo
2. STMAN objects as static logo
Preview_bitmap
During the preview, the bitmap image can be saved in portable network graphics (.png) format, and the black background colour would be converted to transparent.