Separate Shiny plot in a different package from the "core" computations + basic plotting

[ddediu]

PROs:

• not everybody wants/needs Shiny plotting
• separate the dependencies between Shiny (lots!) and computation + basic plotting (very few)
• the two might evolve at different rates

CONs:

• actually, most people might want to use Shiny anyway
• having lots of dependencies might not be an issues for "normal" users (esp. on Windows where all packages can be installed very simply from RStudio -- for macOS and Linux an extra step for installing V8 might be required)
• avoid package demographic explosion
• better integration between computation and Shiny plotting

Notes:

• in the future, we might move completely away from Shiny for interactivity and go full HTML5/CSS/JS anyway

[ddediu]

DONE: now (in the split-shiny-from-base branch) there are two packages:

• the good old AdhereR that implements all the computations and plotting and has very few dependencies and should compile and run on pretty much anything, and
• the new AdhereRViz which encapsulates the interactive plotting (both with RStudio's manipulate and Shiny) and which is fat piece of software with lots of dependencies and that may not run in all settings...

Please have a good look and let me know if you find any obvious bugs or glitches, both in the code but also in documentation (please note that now I transformed the interactive plotting vignette into a regular vignette in package AdhereRViz). As soon as we agree on this, I'll merge all the changes into devel and work with this split. I bumped AdhereR's version to 0.6, while AdhereRViz is at 0.1...

[ddediu]

Seems to be working fine, no obvious regressions or edge cases (so far)...