Categorize actions

[Bill-Kunj]

Currently, all actions are 'top-level' actions, meaning they are all listed in the actions directory.
Now that the number of actions is somewhat large, this makes the menu long, and so manual 'fake' actions have been inserted to create spacers and segment the menu into meaningful groupings.
A 'category' property could be added to actions to allow the JS code to meaningfully organize them and add appropriate spacers in between the categories, thereby removing the 'fake' action spacers and giving us flexibility in categorizing them.

[Bill-Kunj]

The actions could be divided up into subdirectories, with the subdirectory name used as the category