Tables: (Breaking) Added ImGuiTableFlags_SizingFixedSame, ImGuiTableFlags_SizingStretchProp. Removed ImGuiTableFlags_SameWidths.

Simplified some code and clariffied that currently non-resizable = always revert to default (while waiting to untangle Fixed vs Auto and programmatic override not going through TableSetupColumn)
Whereas ImGuiTableFlags_SameWidths has some unusual handling of mixed Fixed/Stretch columns, we know treat them separately.
4 files changed