webos_base: Add bbclass with unpackall and patchall tasks

[OWEBOS-2879] Implement unpackall and patchall OE tasks

Open-webOS-DCO-1.0-Signed-off-by: Martin Jansa <martin.jansa@palm.com>
Change-Id: I6a098e017364bc46badc22ba47d179cc9409a67b
Reviewed-on: http://g2g.palm.com/1216
Reviewed-by: Build Verification
Reviewed-by: Herb Kuta <herb.kuta@palm.com>
Reviewed-by: Martin Jansa <martin.jansa@palm.com>
Tested-by: Martin Jansa <martin.jansa@palm.com>
Reviewed-by: Susan Montooth <susan.montooth@palm.com>