Add different cursor skip modes

[LevFendi]

There are various use cases where using different cursor skipping rules or features would be valuable, such as when analyzing electric grids or fluids.

B stride / structure travel should be demoted to become just one of these features, because its bugs and slow load time make it not that useful.

Another possibility is to remove structure travel entirely, if the other cursor skipping features prove to cover all the use cases. The list of use cases noted by @ahicks92 include:

• Move to next building in this direction
• Move to next building with a different recipe (covered)
• For storage tanks, stop at fluid changes.
• Also for storage tanks, keep going and don't stop at different orientations as long as they're hooked up right to let fluid flow.
• Move to next building that's not connected by power.
• From above, move by width and/or height of held blueprint.
• Follow transport belt I'm on to beginning or end.
• Stop when pipes become truly empty
• Stop at pipe fluid changes

[LevFendi]

Structure travel has lately been moved to CONTROL + SHIFT + ALT + S. This makes it pretty tucked away for anyone who might want it despite its flaws. The other cursor skipping modes are still being thought out.

[ahicks92]

Structure travel is gone. It relied on the old scanner code and was killed with scanner for that reason. I don't think this issue is immediately relevant anymore but much of it might still be nice so leaving it open otherwise.