Fluid: Fix in addition to new obstacle distance parameter

The obstacle distance value should only be used when using second order boundaries.

Fluid: Added obstacle fluid distance parameter

Being able to adjust the distance between fluid and obstacles comes in handy when trying to achieve a fluid motion over inclined obstacles.

Depending on the slope of such obstacles, already small adjustments of this value can help when particles stick to obstacle surfaces (i.e. make particles not stick to obstacles).

Fluid: Add missing versioning for new options in 'Viewport Display' panel

Files created before D8705 was merged need to get initial values for the new viewport display fields.

Fluid: Added domain check for new OpenVDB precision 'Mini' type

Precision 'Mini' should only be available for liquids domains.

Fluid: Add versioning for fluid particle physics type

Setting this type is required to prevent fluid particles from being treated like physics particles. The actual fix for this was made in rB11a8a6d0e6b5.

Fluid: Fix for issues with external forces

A general refactor / fix commit that should clear out the issues that have been reported on external forces and moving effectors (e.g. T79537, T81660, T80088).

Fluid: Add phystype to fluid particle settings

When creating a particle system to display simulated particles, the phystype needs to be set to 'no physics' so that particle positions are just copied and not integrated.

Fluid: Update Mantaflow source files

Updated files includes:
- Fix for smoke / fire emission from particles
- Custom precision for liquid particles when saving in OpenVDB format

Fluid: Enabled OpenVDB precision argument

This way particles can be saved with the custom OpenVDB precision options that were introduced in the latest Mantaflow update.

Fluid: Removed fluid levelset argument from pressure solve

It seems that this was causing the instabilities at slanted obstacles (with secondary boundary (fractional) collisions enabled) ...