Add MacroDict

Macros are resolved for set commands. A contributor wanted to add a
setting for a date format string to be used in ranger's status bar. The
string they tried happened to include `%d` which is a valid ranger macro
for the name of `thisdir`. This attribute is not yet defined when ranger
is reading `rc.conf` and this uncaught exception would crash ranger.

To work around this we need to catch `AttributeError`s for values that
might not exist yet. To avoid the repetition that'd come with all these
try-catch statements that behavior has been encapsulated in a new
MacroDict. This is almost as easy to use as the regular python
dictionary used previously. The only difference being that we need to
wrap values that might cause problems in a python `lambda`, though it
doesn't do any harm to wrap values that can't raise exceptions.

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