New Campaign Selector, enhanced support for campaign mods (and campaign balance mods)

[past-due]

Add a brand-new campaign selector UI, which lets you easily pick between the Original Campaign and (newly-packaged) additional campaigns.

Newly-packaged campaign mods can all be placed inside mods/campaign, and the new selector screen lets you pick which to load when starting a new game.

Once you've selected an overall campaign, you'll be able to configure:

• Difficulty
• Balance (for Original Campaign)
• The starting campaign (ex. Alpha, Beta, or Gamma for the original campaign)
• "Tweak Options"

Tweak Options provide additional toggles that can be configured to customize the campaign experience, such as:

• Timer Power Bonus
  • Grant power based on the remaining level timer, so there's no need to wait out the clock.
• Classic Timers
  • Alter / disable timers on specific levels, like the original release. (Allows power-cheating.)
• 40 Unit Limit
  • Lower the player's unit limit to 40, matching the original PS1 release.
• Autosaves-Only
  • Disable the ability to manually save / quick-save, limit autosaves to the beginning of each level.

Alternate campaign mods can provide their own custom tweak options as well.

Campaign mods now provide a mod-info.json file which contains important information, including compatibility.

Remaining TODOs:

• Implement support for the built-in tweak options in the base original campaign scripts
• Implement core support for the "autosaves-only" tweak option
• Package and include the "classic balance" mod

Possible Future TODOs:

• Display version number for alternate campaigns

[Chewbakka-Wakka]

This is pretty cool, I quite like these:

Timer Power Bonus
Grant power based on the remaining level timer, so there's no need to wait out the clock.

40 Unit Limit
Lower the player's unit limit to 40, matching the original PS1 release.

[ManManson]

Really nice UI for the campaign selection, thanks!

I only have a single technical concern about the PR. Wouldn't it be easier and cleaner to completely separate original remastered and original classic campaign modes by having a distinct set of JS scripts for each?

I see a lot of if (camBalanceClassic()) stuff here and there in the scripts and IMHO it would be much nicer not to share the same scripts for both modes.

But, maybe I'm missing something here. What do you think, @past-due and @KJeff01 ?

Also had a couple of minor nitpicks, but, other than that, the PR is just fine 🙂

[past-due]

I only have a single technical concern about the PR. Wouldn't it be easier and cleaner to completely separate original remastered and original classic campaign modes by having a distinct set of JS scripts for each?

I see a lot of if (camBalanceClassic()) stuff here and there in the scripts and IMHO it would be much nicer not to share the same scripts for both modes.

Because classic campaign mode is largely just a variation on what's already there (with stats changes of course), and the script changes are fairly minor to support research differences (and a few other small things), this seemed preferable (also from an ongoing maintenance standpoint). It also makes it easy for anyone to quickly check what the differences actually are between the two modes, IMHO, because they can just search for camBalanceClassic().

EDIT:

Also we want to set a certain example: For campaign balance mods to have the best chance of continuing to work in future versions, they should be as limited as possible. (And, ideally, stats and only the most minimal script changes that are absolutely needed.)

Since with the way mods work, if a campaign balance mod includes an edited cam-whatever.js, that’s always the version that gets loaded. And if the base one diverges or has fixes, the balance mod will not pick them up (without someone manually going in and rebasing / updating the packaged files in the mod).

Whereas, if a campaign balance mod is just stats files, it’s almost guaranteed to work long into the future, even if we make various other tweaks / fixes to the core campaign scripting.