D25305: Add Total/Available/Allocated memory sensors

[Arjen Hiemstra]

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REVISION SUMMARY
  This exposes the previously hidden Total memory amount as
  "mem/physical/total".
  
  It also add an "Available" sensor, which reads the "MemAvailable" field
  from /proc/meminfo. "Available" provides an estimate with how much
  memory is available for starting new applications.
  
  Finally, it adds an "Allocated" sensor, which equal "Total - Available"
  and represents the total amount allocated to all currently running
  applications.

TEST PLAN
  The sensor browser now lists "total", "available" and "allocated" sensors.

REPOSITORY
  R106 KSysguard

BRANCH
  memory_sensors

REVISION DETAIL
  https://phabricator.kde.org/D25305

AFFECTED FILES
  ksysguardd/Linux/Memory.c
  ksysguardd/Linux/Memory.h

To: ahiemstra, #plasma
Cc: plasma-devel, LeGast00n, The-Feren-OS-Dev, jraleigh, fbampaloukas, GB_2, ragreen, ZrenBot, ngraham, alexeymin, himcesjf, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, ahiemstra, mart
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