[freebsd91p7][vim] vim bookmark improvement

(vbookmark)
1. coloring bookmarked line
2. bookmark follow session
   1) ma to clear in-session bookmarks only
   2) mA to clear all bookmarks

(showmarks plugin)
1. disable by default
2. \mt - enable quick bookmark for moving

(vim minor changes)
1. no cursor line in clean mode
2. removes c-f12 hotkey

TODO: MY_PROC_TABBAR_SWITCH() is not working; maybe need to modify