Additional parameters for launching

yofi's input support some additional parameters setup for launched program. All of the parameters are specified at the same input field after the search string:

• x !! y executes a program found by search string x with arguments listed in y;
• x ~ y executes a program found by search string x with working directory y;
• x # y executes a program found by search string x with env vars specified in y (e.g. MYVAR=xyz MYVAR2= MYVAR3=abc);