Support sketches

[gaocegege]

Processing.R does not have the concept about sketch, now.

Edit:

1. Tab contents are currently ignored by the R mode compiler -- tabs are NOT concatenated into the sketch. before compiling / running, and treated like one big text file.

2. Creating a new Tab2 in a PDE sketch gives the error: ".r is not a valid extension"
   New tabs are possible if manually named with the extension ".rpde", and new tab contents are saved-loaded correctly when PDE saves and loads. However they are ignored as above.

[jeremydouglass]

Please edit the description above and explain what you mean by "support sketches" in this issue using more detail.

I'm guessing that you aren't referring to static mode or standalone sketches... do you mean something about .rpde files? or file menus in PDE? Or file type launching in desktop OSes?

[gaocegege]

I mean Processing supports compile multiple files in one sketch folder, and R mode does not support it.