TGA transp, 64bit, fixed parts not getting loaded

- improved logging
- changed tga loader behavoir to use Argb over Rgb on most 32bit files
- added a 64bit cfg for netWrapper
- 64bit version of netWrappe will be loaded on 64bit KSP versions
- initial "unloaded" texures are not half transparent (might help with
mod-compatibility)
- fixed parts not getting loaded when requests where canceled