BView: Rename parameters for consistency, docs.

No functional change.
BView docs: move description up, few updates.
Update BView docs, especially MouseMoved()
BControl: Style fixes, variable renaming for consistency, docs.

Also some other style fixes, no functional changes intended.
BControl docs update.
BCheckBox: Style fixes, variable renaming for consistency, docs.

Also some other style fixes, no functional changes intended.
BCheckBox doc updates.

Many missing methods added.
BRadioButton style fixes for docs.
Add documentation for BRadioButton.
BButton style fixes for docs.

No functional change intended.
Update BButton docs.

Document some old missing methods, but more importantly
document the new methods added by Ingo recently.