print list of updated files after compileAttributes

only save cpp docs before sourcing if they are dirty

add sourceCpp build hooks

don't require apparmor debian packages

Merge branch 'v0.97-100'

Merge branch 'v0.97-100'

background highlighting for cpp

background highlighting for cpp

use updated name for sourceCpp

Send interrupt even when server does not appear to be busy

In some cases (such as shiny::runGist on the Mac) the IDE can get into a state where the server is busy but the client doesn't think it is, so there's no way to interrupt. This logic will send server interrupt on Escape keydown in some cases where it's currently just sending a null console event. I've tested with shiny::runGist, Sys.sleep, and scan() and it's worked well in all 3 cases.