Internals: (Breaking) renamed RenderNavHighlight() to RenderNavCursor(), ImGuiNavHighlightFlags to ImGuiNavRenderCursorFlags. (#1074, #2048, #7237, #8059, #1712, #7370, #787)

+ referenced in #8057, #3882, #3411, #2155, #3351, #4722, #1658, #4050.