stop polluting --path

[fowlmouth]

I want to remove all those extra --paths and --passC:"-I.."s.
from particle.nim: import urhomain, ui, stringHash, variant, octree, renderer, component, color, text, uielement, resourcecache, scene, node, vector3, camera, view, input, context, ptrs, drawable2d, graphics, particleemitter2d, particleeffect2d, engine it is not obvious where a module is in the directory heirarchy. The result would be import vector3 is now import math/vector3, creating a prelude module that imports and exports everything might not be a bad idea too.
I would also fix all header pragmas and #includes so that the only path needed is ../Urho3D-1.32/Source/Engine
Should I proceed?

[Araq]

I don't like it. Note that we didn't patch the headers at all except for a minor issue.

[fowlmouth]

I care more about the modules than the headers.