Remove "auto" wall direction option

[vovodroid]

Refactoring of Allow specify wall directions #4156.

Simplify wall direction option. It assists with further wall related development. For example I separated between internal and overhang walls reversing, and added option to print overhangs after internal to improve adhesion while keeping external wall first for outer-inner and inner-outer-inner modes.

1. Auto mode was removed. Just turn reversing on/off for both direction.
2. Spiral vase could be printed in any direction.

I hope current direction logic was kept. Let me know if something is missed.

[CristianGTR97]

very clever

[discip]

@vovodroid Is the unfortunate behavior I mentioned here https://github.com/SoftFever/OrcaSlicer/pull/6236#issuecomment-2251426051 also addressed in this PR?

[vovodroid]

No, this PR is only base for other changes addressed in my fork. Probably these changes fix your issue.

[vovodroid]

@SoftFever @Noisyfox what do you think about this? I have some more improvements basing on this PR.

[vovodroid]

@Noisyfox ?

[Hammerfest]

For example I separated between internal and overhang walls reversing, and added option to print overhangs after internal

I have experienced this, an overhang printing before the inner making at least that area less structural and rough looking.

As a PR that's approaching a year old, is there a problem preventing it's merging? I notice quite a few pages of merges sitting stale while attention seems to be only given to newer PR.

[vovodroid]

is there a problem preventing it's merging?

Waiting for @Noisyfox / @SoftFever )))