Look at the channel naming conventions for the itchio uploader again

[Norgg]

Currently the zips are all named sphereface-sphereface-for-*.

[Riot]

exclude repo name from itchio channel name, resolves #278

→ <<cset f1ccc276cb03>>

[Riot]

make sure channel name is used consistentlu in uploader, re #278

→ <<cset c32050570f70>>

[Riot]

update channel name in online version checker, re #278

→ <<cset 5e15add11573>>

[Riot]

Removing milestone: Beta (automated comment)