feat: general support for unicode symbols

[neo451]

There are many issues regarding handling of non-latin characters.

• Tags

  • Tags with swedish characters (åäö) does not work epwalsh/obsidian.nvim#766 this one has some discussion

• Follow link

  • ObsidianFollowLink on link with Chinese heading like[[filename#heading1]] not work very well. epwalsh/obsidian.nvim#839 solved by fix(util) : allow non-english file name and anchor for link #60
  • Completion and ObsidianFollowLink not working for heading in chinese  epwalsh/obsidian.nvim#669

• TOC

  • :ObsidianTOC doesn't output all headings in non-latin languages epwalsh/obsidian.nvim#789

Relevant Pull Requests

• Fix issue not remove Chinese Anchor epwalsh/obsidian.nvim#840
• Completion Incorrect autocomplete inserts to lines with non-latin chars epwalsh/obsidian.nvim#834