OmeroCpp: Glob example sources

Note that it is not possible to glob any of the examples under
Delete or OmeroClients due to having multiple example programs
within each directory.  Regions of interest has just one source
file, making globbing pointless.  TreeList does have several
headers, and so is the single example which can actually use
globbing.  However, this makes it inconsistent with the other
14 examples which don't (and can't) use globbing.