RecentsPanel: Make CircleMemoryMeter bigger, adjust accordingly ClearAllButton

PS5: Fix rect size of CircleMemoryMeter, now it's shown respecting the screen borders
PS6: Fix position and size of "the three bars" ("Clear all" button)
PS7: Fix copyright headers and spaces
PS8: Add some comments to the new parts
PS9: Changed code style, now lines are shorter
PS11:
   CircleMemoryMeter size is now decided in cm (only for tablets),
   in this way we can know the size of the circle before it is drawn
PS12: Removed debug tag I inserted for testing, centered and risized ClearAll button
PS13:
   Changed size and edited ClearAll images directly in res
   folder(it's easier this way and the device don't have to do this by itself like in previous
   patchsets),now this will make the circle bigger for all devices
PS14: Final cleaning
PS15: Found a better way to make changes(in res folder)
PS16: Restored original format of the edited files
PS17:
   Added new resources for ClearAllButton in recents
   (now different from the ones for ClearAllButton in notification shade)
   Thanks to Max Weninger for pointing this out

Change-Id: I56f2ae7f23433ef0b4d4eaf893be14a09edf7b19
[Patch 17]RecentsPanel: Make CircleMemoryMeter bigger, adjust accordingly ClearAllButton

PS5: Fix rect size of CircleMemoryMeter, now it's shown respecting the screen borders
PS6: Fix position and size of "the three bars" ("Clear all" button)
PS7: Fix copyright headers and spaces
PS8: Add some comments to the new parts
PS9: Changed code style, now lines are shorter
PS11:
   CircleMemoryMeter size is now decided in cm (only for tablets),
   in this way we can know the size of the circle before it is drawn
PS12: Removed debug tag I inserted for testing, centered and risized ClearAll button
PS13:
   Changed size and edited ClearAll images directly in res
   folder(it's easier this way and the device don't have to do this by itself like in previous
   patchsets),now this will make the circle bigger for all devices
PS14: Final cleaning
PS15: Found a better way to make changes(in res folder)
PS16: Restored original format of the edited files
PS17:
   Added new resources for ClearAllButton in recents
   (now different from the ones for ClearAllButton in notification shade)
   Thanks to Max Weninger for pointing this out