Add user formatting control via template and other fixes

[eugenesvk]

A bunch of improvements:

• add user settings to reorder count groups / individual counts via a status_template template string (partially addresses Redundant counts #10)
• add minute_separator user setting for separating 5m 2s in time
• add in_group_separator user setting for separating line/word/char counts
• 🐞 don't leave old statusbar messages when changing its position via status_order_prefix (partially addresses Redundant counts #10)
• add Command Palette commands to open settings files Preferences: WordingStatus Settings or WordingStatus Settings: User/WordingStatus Settings: Default

BUT

• moderately reformatted since I was adding to my local plugin that I've made more readable to me (less whitespace, more tabular alignment etc)
• moved to the new 3.8 Sublime Text plugin host, so the plugin manifest needs to be updated to reflect that (likely raising the min version to 4170) and a new tagging scheme needs to be introduced to make the new commits

So sorry about non-"atomic" PR

[evandrocoan]

Thanks for the pull request. I should be able to review it next weekend.