Update documentation for split blocks.

Change dropdown order for split blocks. Make dropdown change name of
second arg to indicate when input must be a list. Adjust block mode on
reading the XML

Change-Id: Ia93b0c10733502153730ceb7fec798470df77f09
Adds conditionals for list picker and web viewer activities in Manifest

Change-Id: I55ded4ee436da4ea775c3287dbd29ea20b3ead83