V2 rewamp

[srg-kostyrko]

I'm starting work on V2 of plugin that will be quite big revamp on code level to make further development of plugin easier and also simplify introducing several planned features.

And while most changes are on code level there will be also changes visible to user (plus I plan to include some new features in v2 as well):

• I getting rid of several journal types (calendar and interval) - journal will be set of notes that you write on regular basis - daily, weekly, monthly or some custom period (like every 2 weeks). So instead of one calendar journal that includes daily and weekly notes for example there will be 2 separate journals.
• Introducing journal shelves - a way to group several journals in settings (similar to calendar journal right now) and also to control calendar view (to limit it only to some shelf)
• start/end will be available in all journals (now it is only in interval ones)
• indexing will be available in all journals (now it is only in interval ones)
• it will be possible to define several templates (to allow complex scenarios - like template for specific days of week + generic one for others)
• it will be possible to configure commands for specific journal
• Configurable highlights for calendar view and code blocks

I created a separate project to track progress - https://github.com/users/srg-kostyrko/projects/3 The list of items there is preliminary and might grow as I work on changes.

The development will be going in separate branch v2-dev.

I also consider releasing beta version using BRAT plugin if there will be anyone interested in checking it out before final release.