[Powertop] PowerTOP UI navigation enhancement.

This patch add more ui navigation features allowing for the scrolling of PowerTop content for each tab. This is done by controlling the location of the winpad, and refreshing the terminal window when needed. To do this, the navigation keys have been updated as follows. "Arrow Keys" now scroll the tab windows "Page up/down" scroll tab windows up and down "TAB" cycles the next window tab "SHIFT+TAB" cycles the previous window tab "ENTER" toggles tunables "SPACE BAR" toggles tunables "r KEY" refresh results and resets view of tab window. Known issues: There is no handler for terminal re-sizing. The workaround is to use "r KEY" to refresh if terminal windows size is changed mid session. --- src/cpu/abstract_cpu.cpp | 1 - src/display.cpp | 98 ++++++++++++++++++++++++++++++++++-------------- src/display.h | 13 ++++++- src/main.cpp | 17 ++++++--- 4 files changed, 93 insertions(+), 36 deletions(-)