Far-Sighted and Near-Sighted trait should not be mutually exclusive

[AngelicosPhosphoros]

Describe the bug

When starting game, player cannot choose both near sighted and far-sighted traits.

Steps To Reproduce

1. Start to choosing player traits
2. Choose near-sighted
3. Now you cannot choose far-sighted

Expected behavior

Near-Sighted people became far-sighted to 50 years old and then keep to have both eye disorders.
The game have even an item for such people: bifocal glasses.

So this traits must be choosable both, and player should start with bifocal glasses.

Screenshots

No response

Versions and configuration

Version de64c76.

Additional context

No response

[AngelicosPhosphoros]

Probably caused by mutations code:

Cataclysm-BN/data/json/mutations/mutations.json

Line 764 in de64c76

"cancels": [ "MYOPIC" ],

Cataclysm-BN/data/json/mutations/mutations.json

Line 718 in de64c76

"cancels": [ "URSINE_EYE", "EAGLEEYED", "HYPEROPIC" ],

[Coolthulhu]

The reason they are exclusive is balance: contacts, bifocal glasses, and eye replacing CBM affect both traits, so the player was incentivized to take either both of the traits or none.

[AngelicosPhosphoros]

We could split contacts into 2 groups (and make player cannot actually wear both kinds); bifocal glasses seem to spawn rarer other kinds and for CBMs it seems to be expected.