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