[Powertop] PowerTOP UI navigation enhancement.

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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(-)



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