Number key support

Rather than exiting with error.

Now xmenu detects if a menu has an icon, and if it doesn't have, the
menu will not have the gaps fgor icons, making the -i flag unecessary
to disable the padding.   The -i option is still necessary, however,
to speed up xmenu loading, since it disables imlib2 initialization
routines.

Reformat README to be nicer looking

little update to get people interested

Also changed license.

Redrawing an icon every time the cursor moves between items costs a lot
of time.  So now each icon is drawn once, and s copied when needed.

Changing config.cursx and config.cursy to config.posx and config.posy.
Adding the parseposition() function.

Widths and x positions no more depend on item->h.

• Adding support for gaps (#3)
• Adding more comments and categorizing function declarations.
• Adding support for EWMH properties (xmenu look is now consistent
  in some window compositors).
• Changing how configuration is done (now all configuration belongs
  to the config structure).

commit b0f37c9fdb
Author: phillbush <phillbush@cock.li>
Date:   Mon Jun 29 09:58:36 2020 -0300

    Compile time error fixes

commit e6bf27768f
Author: Karl Martin <karlmartin895@gmail.com>
Date:   Sun Jun 28 23:08:02 2020 -0400

    v1.01

    add: user can set gap width prefs

commit 0cca216309
Author: Karl Martin <karlmartin895@gmail.com>
Date:   Sun Jun 28 23:04:10 2020 -0400

    INIT: func addition + error fix

    hack + prefs: extra x,y padding for initial menu
    add: x padding for child menus
    fix: 2x compile time errors