Fuzzy opener commands

[andreikop]

• Understand ../ as "please scan upper directory as well;
• .exe as "please include .exe files now, I really want to open one";
• f as strongly prefer current file's directory for now;
• l maybe should just duplicate Locator logic for jumping to lines for now. Maybe l qqq should offer the list of lines containing qqq to jump (in current file, maybe in other files as secondary choice);

By @vi

[andreikop]

• Scanning ../ might be useful, but it is too complicated for user and for Enki. I would prefer to open upper directory as a project and use regular Fuzzy matching.
• .exe can be opened with 'o' command. I wouldn't like to include it to fuzzy search, because ignored files are rejected when scanning the file system and the list of files is cached. If we include all files when scanning the FS, it will slow down fuzzy-filtering.
• I think it is fine with current directories now
• I'm not sure I understand about qqq. But now fuzzy open understands line numbers. Is it fine?