Move liblight to vaquish-common

Change-Id: I8f8953cb4547ff0c4aa3e9ca756d526358da5636
Move keychars and keylayout files to vanquish-common

Change-Id: I93f776100114e8049f46c60b9adc2947bd96aa0f
Move libpower to subdirectory

Change-Id: Iecfa84f4843ad58a335e9b6a75d0f46cff301450