Append and fix entries in symbols.tsv

[tats-u]

Description

• Add convenient ways to type symbols and fix missing ways (e.g. "ちょさくけん" → "©" (non-emoji), "＋ー" → "±")
• Force non-emoji styles for Red Dragon because it can be emoji
• Fix description of Horizontal Bar
• Make possible to convert kana with dakuten (e.g. あ゙) without direct codepoint conversion
• Add cbrt & qdrt symbols

Issue IDs

Steps to test new behaviors (if any)

A clear and concise description about how to verify new behaviors (if any).

• OS: any

1. "どうじょう", "おなじく" , "のの", "ののじ", "ののてん", "ののじてん"→ 〃
2. Horiontal Bar U+2015 (from "-") is described as "水平棒")
3. "+" → "-" → Space generates ±, and "-" → "+" → Space generates ∓
4. Double hypen is suggested by "=" → Space
5. "d" "o" "c" Space suggests ℃
6. "d" "o" "f" Space etc. suggests Fahrenheit degree signs
7. "さいころ" + number or number → Space suggest the corresponding dice symbol
8. In GitHub, "ほんちゅん" → Space suggests the non-emoji text symbol
9. "ちょさくけん" suggests non-emoji copyright symbol
10. あ → " → Space produces あ゙.
11. (In kana mode) あ → ゛ → Space produces あ゙

It's a pain in the buttocks to enumerate all cases in this week. I'll update this in next week.

Additional context

Add any other context about the pull request here.

VS-15 (U+FE0E) is added after Red Dragon and Black Joker.

One or both of Fahrenheit signs can be removed.

[hiroyuki-komatsu]

Hi tsts-u,
Thank you for your PR!

Please check my comments.

[hiroyuki-komatsu]

For PRs in future, please refrain from adding the contents in the middle of the review.
Thank you,

[tats-u]

I thought it is a little pain of a neck to switch or merge multiple sets of symbols addition.
I'll make sure to create another branch on additional symbols.
e.g Yijing Hexagram Symbols (六十四卦), which are sometimes treated to be a part of CJK or not, and Kanbun symbols.

[hiroyuki-komatsu]

Thank you for the update. We are almost there.