parsing semi-regular orthographic patterns

[CallumBeaney]

• Þ, þ : they the same or not?
• ȝ, 3 : some websites use a 3 (三)
• "upon" may be e.g. "vpon" consistently
• U is often subbed with V e.g. auenturus
• soden may be written ysoden; fried/fryd/fryed may be y-fryed/y-fryd (this is dialectical)
• odd rules: "each" is written "vch" in some texts, esp. e.g. Gawain
• variation scope: e.g. "though" --> though, thou(g(e, thoch, þaiȝ, thauthȝ, yogh(e, ȝauȝ, þurȝ (see this article for more info about how to identify patterns in this)

I will update this issue OP as I note/remember new things.