Slight texture alignment tweak for new RPG-7

Finally added the RPG-7. Sorry it took me so long, was very busy with other stuff. I'll get to the other launchers eventually, but since the RPG-7 was highly requested I added it first. Also, vanilla users now have access to the MAAWS.

Added a preview image entry for the RPG-7.

Fixed problems with underbarrel weapons for vanilla users. They can now be properly reloaded.

Minor backend tweaks, move along civilian

!!! Vanilla users now have access to weapons with underbarrel attachments, including the Type 115 !!!

Uses steel to reload.

Added a custom mod icon

[Combat Extended] General Machinegun buffs:

- Mk200 has reduced recoil.
- Fixed Navid's incorrect burst shot count.

[Auto-generated text]: Initial upload.