[RFC] Overhaul training

[lewri]

Fixes #1458
Fixes #2262
Fixes #2603

Describe what the proposed change does

• Overhauls the training system to be a bit more akin to TH (based on dissection in 1458). It also means training is more reactive to several factors (TODOs in code).
• The math.rand modulo function was not incorporated, as it caused a lot of groundhog day scenarios with docs nearer consultant level
• Large explanation comments currently left in, to be moved to the Wiki, and shortened in the lua file, if plan to merge.

For award values following this PR: (before PR general skill was 0.0035 regardless of factors)

1-3 trainees with 1 consultant (no specialities): 0.004 per day (0.03 junior to 0.750 
con in 180 days)

1-3 trainees with 1 consultant (surgeon): 0.002 per day general; ~0.008 per day surgeon 
(125 days to get specialism) (general goes to 0.004 after specialism obtained)

Trainee's attention to detail, consultant's skill, and a triangular distributed random 
number affect skill gained +-10% (individual to each trainee)

Trainees in room over 3 lower skill gained by 2/n-1 per trainee

Skills taught lower skill gained by 1/skills taught (generalist skill counts as a 
skill)

Minimum award is always 0.001

The max skill a doctor can have to get surgeon certification is ~0.5 at the start 
(teaching all 3 specialisms at once to <=3 trainees).

(Another comparison is Cons. Psychiatrist with trainee psych skill per day: Before PR - 0.0118; After PR: - 0.0105)

Please do test this as I need to know whether the balance is correct. If you need a good level in the main game try Level 9

[lewri]

As Alberth said, we're not likely to get balance testers until the PR is in the game so I've marked as ready.

If we're merging let me know first so I can remove all the comments for the wiki.

[lewri]

Wiki comments removed now ahead of time. You can view them still under 98bb983 as removed lines.

[ARGAMX]

Great enhancement.
I'd like to help to get this merge done.
I'd like to test this in game.

[Alberth289346]

Great enhancement. I'd like to help to get this merge done. I'd like to test this in game.

You can get the branch in 2-3 ways:

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1. Download the branch of this PR:

GH documents how to get a PR: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

• Starting at step 3: ID = 2314
• Step 5 then becomes the magic git fetch origin pull/2314/head:training_overhaul
• Step 6 then becomes git switch training_overhaul

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2. Add the Lewri GH repository as a remote to your local copy of the repository:

git remote add lewri [email protected]:lewri/CorsixTH.git

Now you can do git fetch lewri training_overhaul to get the branch from the GH repo of Lewri.

Then switch to the lewri/training_overhaul branch.

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You can also get the changes of the branch as diff files, and apply the changes yourself.

[ARGAMX]

You can get the branch in 2-3 ways:

@Alberth289346 thanks for the detailed instructions 👍

I get that functionality with your help 👌