Improve sub-command args syntax

[rdsubhas]

# Before
myke --loglevel=info ... task1[a=1] task2[b=2]

# After
myke --myke-args task1 --task1-args task2 --task2-args

# User-defined task example
myke -v -f *.yml doSomething --from=a doSomethingElse --to=b

# Built-in tasks example
## either special actions that start with /
myke /template --file xyz.tpl
myke /licenses

## or flags
myke --template xyz.tpl
myke --licenses

[fiji-flo]

really like the look of this:

# User-defined task example
myke -v -f *.yml doSomething --from=a doSomethingElse --to=b

And would vote to use flags for built-in actions:
myke --template