Implement improved incremental highlighting

- highlight other window too!
- close #42
update vital-over: fix cursor highlight for some colorscheme
Merge branch 'update-vital-over-cursor-highlight-fix' into dev
spec: g:incsearch#no_inc_hlsearch
doc: :memo: g:incsearch#no_inc_hlsearch
Merge branch 'inc-hlsearch' into dev
Merge branch 'dev'