Changed build/all.py to use argparse
Changed build/all.py to use argparse

To help standardize how we parse arguments across all our build scripts,
this changes build/all.py to use the argparse library (the same as
build/test.py).

Change-Id: Id492675e289f35e42d9445ade3008a4159067e38

tvoli/shaka-player,vimond/shaka-player,shaka-project/shaka-player,vimond/shaka-player,tvoli/shaka-player,TheModMaker/shaka-player,tvoli/shaka-player,vimond/shaka-player,shaka-project/shaka-player,shaka-project/shaka-player,tvoli/shaka-player,shaka-project/shaka-player,TheModMaker/shaka-player,TheModMaker/shaka-player,TheModMaker/shaka-player