[Feature] Relic locking / exclusion filter

[fribbels]

Motivation

Currently the only way to exclude a specific relic is to equip it to a lower ranked character and enable the rank filter. Sometimes some users want to avoid using a specific relic because its reserved (for swapping onto fast bronya for example)

Objective

Allow relics to be 'locked' and excluded from optimization searches, or allow some other way to exclude a specific relic. The locked status should be displayed on the relic preview and in a Relics tab column / be filterable

[cnojima]

I haven't use the "lower ranked" char thing yet, but would it make sense to:

• initially "Only Unequipped" option?
• eventually: enable per-char selected list of white/black-listed equipping chars (e.g., limit relics in optimizer pool equipped by a subset of selected chars).