Hardened Bulkheads added to Offensive Retrofits

Continuing to slowly but surely update articles to wave 7 by adding Hardened Bulkheads to the offensive retrofits article:

Raider-II section updated to include Heavy Ion Emplacements

Heavy Ion Emplacements make a huge difference to Raider-IIs and that is now reflected in the Raider article. Later on I'll be updating the VSD(-II) and Interdictor build sections of their articles to mention HIEs, but likely won't make too much noise about it. It bears mentioning for the Raider-II, though. Here's the relevant section:

Heavy Ion Emplacements

John and I are getting around to updating older articles due to wave 7 (the list is very long). As it was in wave 6, we're trying to thread the needle between "getting new information up as soon as possible" and "actually having some experience with what we're discussing," so don't be too surprised if earlier impressions are later updated in light of a greater depth of experience later on.

For now, I've updated the ion cannons article - there was a bit of editing but primarily I updated the article with a section on Heavy Ion Emplacements: