Plugin renewal plan

[tsuyoshicho]

• automatic & manual (selectable) grepprg setup
  • grep program pre-detector
  • completion function
  • per grep program grepprg & grepformat pattern database
• new async grep command
• grep program pre-detector(same as setup)
• per grep program command pattern database
  • smartcase
  • ignorecase
  • non-ignorecase
  • file-search regexp
  • file-search glob
• option switching above settings
• default setting (like Fg command) auto selection priority list (["ag", "pt", "rg", ... ])
• per grep program custom comand (like FgPt)
• setup delay feature (Setup work after VimEnter)
• pattern database using json, yaml, toml or other outer configuration file
• and others