Let vim support file list, search history, tag list and neat interface
Search word: 'ctrl + f'
nnoremap :call SearchTag()
Search history: 'ctrl + h'
nnoremap :call SearchTagHis()
Repeat last search: 'ctrl + l'
nnoremap :call SearchTagLast()
window switch: 'gb'
nnoremap gb :call BufSel()