[PATCH 3/5] perf ui/tui: Implement log window

Implement a simple, full-screen log window which shows error messages saved so far. Press 'l' (lower-case 'L') key to display the log window. It'll be used usually with -v option. Protect updating log by ui__lock to prevent the linemap reallocation during log window refresh (it led to a

[PATCH 3/5] perf ui/tui: Implement log window

Implement a simple, full-screen log window which shows error messages saved so far. Press 'l' (lower-case 'L') key to display the log window. It'll be used usually with -v option. Protect updating log by ui__lock to prevent the linemap reallocation during log window refresh (it led to a