[FEATURE] I want css classnames for other widgets

[codyduong]

Currently CPU is the only widget that has custom class names appended based on properties. To make styling easier we want this to extend to other widgets

• Workspace -> workspace-#
• Weather -> `temp-#, discuss: whether this should in F or C, or both, or configurable...
• Clock -> hour-#, discuss: whether this should have higher fidelity
• Memory -> free-#, total-#, used-#, swap_free-#, swap_total-#, swap_used-#, discuss: whether in MB or GB, or configurable
• Battery -> percent-#, charging (not charging is implied by non-existence of this one), depends on [FEATURE] I want battery to show if it is charging or not #50