config: use reflection to map ini keys to struct fields

The default ini.Section.MapTo() function only handles basic types.
Implement a more complete mapping solution that allows:

* parsing templates, regexps, email addresses
* defining a custom parsing method via the `parse:"MethodName"` tag
* defining default values via the `default:"value"` tag
* parsing rune values with the `type:"rune"` tag

The field name must be specified in the `ini:"field-name"` tag as it was
before. It is no longer optional.

The `delim:"<separator>"` tag remains but can only be used to parse
string arrays.

It is now possible to override default values with "zero" values. For
example:

	[ui]
	dirlist-delay = 0

Will override the default "200ms" value. Also:

	[statusline]
	status-columns =

Will override the default "left<*,center>=,right>*" value.

Signed-off-by: Robin Jarry <robin@jarry.cc>
Tested-by: Tim Culverhouse <tim@timculverhouse.com>

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