Integrate languagetool

[dvdsk]

tracking-branch: langtool

• [x] hard coded path run check in parallel to vale api
• [x] should combine output of vale and language-tool after checking
• [x] start language server (if not running) on setup
• [x] offer to install languagetool if not found, check how grammarous does auto install
• [x] make lang tool integration optional

[dvdsk]

First hurdle, how to do async http req. useing curl for http access (limits to linux/mac with curl install) (good enough for now)

hard coded path run

• [x] add async curl call to example.com to checker
• [x] pipe text into curl and call langtool
• [x] add callback to parse langtool results

[dvdsk]

combine output of vale and language-tool after checking

• [x] ensure language-tool extmark adding does not remove vale extmarks and viceversa
  • seperate extmark namespace, pass namespace to callback
• [x] merge spell checking by vale and language server? Better alternative is to disable any spellchecking in vale if langaugetool is enabled/found

[dvdsk]

start languagetool server on boot

• [x] figure out how to keep forked process running in parallel to vim
  • [x] check if java exists
• [x] start language-server with a hardcoded path

[dvdsk]

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