Using a variables view dispatch and toolbars

[haji-ali]

This pull request proposes two variables calfw-blocks-toolbar-views and calfw-blocks-view-dipatch-funcs for better code factoring and an easier way to add views. These should really be part of emacs-calfw, but that package seems not to be maintained anymore. So I propose either including these variables in calfw-blocks or forking emacs-calfw and basing calfw-block on an enhanced fork.

Context Over in my fork, I made several changes that I think improve the overall view and quality of the calfw and calfw-blocks. One of the main changes is that I split the code for transposed views into its own file since I don't use them. Adding these two variables make it easy to include or exclude these views without re-advising the view dispatch and toolbar rendering functions.

I have used my fork for a while now and I am happy to create pull requests for some or all of these features if there's interest (you can check the readme on my fork for a list of changes).