Various fixes including for regressions on latest RC

[lbmaian]

Several fixes and misc changes. There's two more PRs that will follow this, one that has fixes for mech and CV turrets and related UI, and the other for some MML compat options.

Improved error handling:

• Allow loading units with unknown equipment, also fixing an old backcompat check.
• Allow loading units with equipment in invalid locations.
• Unit saving no longer wipes file on error. Shows unexpected exceptions during saving in a dialog.

UI fixes:

• Fix regression from 69bbe7c that broke multiples of same equipment. I know there's another outstanding PR (Bug Fix - SSW - Multiple Equipment Entries #301) that's supposed to fix it, but don't think conflating an instance of an equipment and the "class" of that equipment for equality purposes is a good idea.
• Use equipment chooser panel from wide CV GUI in all other CV/mech GUIs. This also fixes non-wide CV GUI equipment chooser scrolling regression from e8dd5de. Note: the form files are already out of sync with with the java files and it would be non-trivial to make them work (Netbeans can't handle it, and Eclipse outright crashes).
• Fix wide CV GUI using SSW prefs instead of SAW prefs.
• Reset cockpit command console for new mech.
• Check omnimech eligibility when changing rules level.

Other fixes:

• Fix "All Eras" doubling CV armor cost.
• Disallow vehicular grenade launcher in CV body.
• Remove "Structure" from composite/primitive chassis CritName for consistency with other chassis.
• Armored components are now saved to file in era-specific rules (instead of just experimental rules).
• Cost/BV now properly calculated for coolant pods and armored components in era-specific rules (instead of just experimental rules).
• Read "Unknown"/"None" manufacturer/model as empty string. This also fixes jump jet model still being "None" on a loaded mech after adding jump jets afterwards.
• TRO: Avoid "Unknown" prefix, omit manufacturer/factory section if empty (ala MML), improved jump jet info a bit.
• Fix narrow/low profile quirk cost from 2 to 3 (and fill out its description) - see https://bg.battletech.com/wp-content/uploads/2023/07/Campaign-Operations-2023-07-26-v4.0.pdf
• Separate out quad version of directional torso mount quirk since it has a different point cost.
• Change variable quirk cost from 0 to 1 so user can manually come up with cost by selecting it multiple times.

Misc:

• Add eclipse stuff to .gitgnore. (Netbeans refuses to compile correctly with the ancient version of Gradle being used here, so I defaulted to another prominent free java IDE.)
• Sync SAW dlgPrefs form with java source.
• Fix minor whitespace issue in equipment.json.

[WEKarnesky]

Thank you for submitting this. I will be reviewing it this afternoon after work.