evolvestate: rename the file to state.py and class name to cmdstate
The evolvestate.py and the evolvestate class in it were introduced to help `hg
evolve` grow continue and abort options. But the class and it's API can be
easily used to store state information for other state files like we stored the
information for grab state in the previous commit. Let's rename the the file and
class.
[flake8]
ignore =
#closing bracket does not match indentation of opening bracket's line
E123,
# closing bracket does not match visual indentation
E124,
# visually indented line with same indent as next logical line
E129,
# at least two spaces before inline comment
E261,
# too many leading '#' for block comment
E266,
# expected 2 blank lines, found 0
E302,
# expected 2 blank lines after end of function or class
E305,
# module level import not at top of file
E402,
# line too long (82 > 79 characters)
E501,
# do not assign a lambda expression, use a def
E731,
# class names should use CapWords convention
N801,
# line break occurred before a binary operator
W503
builtins=xrange, execfile