New wind report variables for Weather monitor

* Wind cardinal direction (`windCardinal`)
* Wind azimuth direction (`windAzimuth`)
* Wind speed (MPH) (`windMph`)
* Wind speed (knots) (`windKnots`)
Typo and news update
multiline strings support
Add .xpm support for <icon> via libXpm.

* Adds a new flag with_xpm to enable compilation with xpm support
* Adds a module XPMFile only exporting readXPMFile which almost mirrors
  Graphics.X11.Xlib.Misc.readBitmapFile
* During loadBitmap a file is first tried with readBitmapFile and if it
  fails with readXPMFile
News for multiline config support
Linting for the multiline config support patch
Add the header to XPMFile
Mention XPM support in readme.md when <icon> is introduced
Merge branch 'xpm' of https://github.com/projedi/xmobar
Missing XPMFile module added to xmobar.cabal
mtl 2.2.1
News and readme update
Fix: not colorizings total size in DiskU (issue #189)