nnn v5.1 Moscow Mule release notes.

• [x] add support for custom trash command in $NNN_TRASH
• [x] remember history of last 16 commands executed in the native prompt in the current session
• [x] count files from selection file when no file is selected during selection removal
• [x] show session name in help
• [x] show current entry in reversed bold
• [x] show current (non-auto) session name at save session prompt
• [x] show F in the status bar when filter is inactive in type-to-nav mode
• [x] restore correct filter function on session load, switch filter function on context changes
• [x] extend xreadline() with some by-word movement
• [x] added plugins gpgs and gpgv
• [x] add icon for lzip files, more emoji icons
• [x] suffix the current context number with * in help screen