Screenrecord: save screenrecord in "Screenrecords" directory

previously it was saved in "Screenshots"
also refactor source a bit, remove warnings

PS2: LOG screenshots --> screenrecords

Change-Id: Idf9b024bbbf1816aa91e5e455525750a761ddb73

Conflicts:
	packages/SystemUI/src/com/android/systemui/omni/screenrecord/GlobalScreenrecord.java
Add a timer to screen record

Change-Id: I0851344670ef2e55c044c255daf907d6e72614e0

Conflicts:
	packages/SystemUI/src/com/android/systemui/omni/screenrecord/GlobalScreenrecord.java