[MACH] ZYNQ - bootgen - Accept toolchain with or without trailing -
[OS] Process - Added a current working directory to all processes.
[FS] Added BT_GetCwd() and BT_ChDir() apis.
[FS] Updated FS layers to support relative paths and the CWD process property.
[SHELL] ls - list cwd when no parameter given.
[SHELL] Added cd and pwd commands. Also re-ordered objects list so commands appear alphabetically ordered.