change default text object binds

I've remapped the default binds to aC and iC in order to avoid collision
with the comment text object often used with treesitter.

fix: minor regression

feat: support bracketed urls

perf: improve WikiFoldLevel

merge: simplify and improve bolditalic

refer: #8

Add missing contains=

Simplify & improve bold+italic

Works for *bold _italic_  more bold* etc

fix: minor update

chore: minor adjustment

fix: minor adjustment

merge: add highlighting for bold+italic

refer: #7

Add highlighting for bold+italic

feat: syntax for env vars

feat: better math support

refer: #2

fix: ignore texLigature in fenced tex blocks

refer: #2

fix: minor problem with :: list

feat: added support for md_fig

fix: minor mistake in wikiList

fix: minor error

fix: update to match new wiki.vim syntax