Flag type enum names

[Tarocco]

Unity usually transforms member or type names with UpperCamelCase into separate words and trims leading underscores or replaces them with spaces.

While regular enums are treated this way, flag enums currently appear as their plain names (untransformed).

EXTRA: also maybe replace the text on the dropdown field with "All" instead of "Mixed (#)..." in case all of the flags are selected?

[Tor Esa Vestergaard]

Enum names in the dropdown are now shown using nice variable names. I gave the rest a shot, but it proved to be a significantly larger effort than anticipated, so I eventually aborted. Perhaps one day.