[Imports] Rewritten ogr2osm

[Andrew Guertin]

Hi,

For some files I was working with, I was struggling with some bugs and
limitations in ogr2osm. And since I wasn't smart enough to fix the
problems, I just got rid of them by rewriting.


The three major changes I've made with the rewrite are:

1) Changed the internal representation of objects.

In OGR, features are the important objects, and geometries only exist as
parts of features. In OSM, geometries are the important objects, and
features are just tags on top of geometries.

In the current ogr2osm, the OGR feature is maintained in the data until
output. In the rewritten version, the OSM model is more quickly bought
in to, and features are maintained as simply lists of tags with a
pointer to a geometry they should be placed on.

2) Changed the data structures used to represent the objects

Instead of using a bunch of arrays with matching indexes, I've made
classes for the various geometries and the features, and each feature or
geometry is an object.

3) Added in more object and tag filtering options

I needed to filter out some things from my input that were irrelevant,
and to do some more complex things like setting one object's tags based
on the information from the closest object of a different type.


I've tried to keep the interface as similar to the old version as
possible. Most of the options parsing code, in fact, has been copied
with only minimal rearrangement. The attribute translation will, of
course, be different, but uses the same mechanism.

A few things the old version had I haven't (yet?) implemented. In
particular, the code that looks for shared way segments isn't there yet.
It should be easy enough to implement, but I didn't need it for my data
and didn't want to keep the code hidden. I also did not reimplement the
tag statistics.

I've published on github at https://github.com/andrewguertin/ogr2osm .

I'm open to any comments, positive or negative, so let me know what you
think.

--Andrew