0.2 WIP candidate

[lilyvelour]

Breaking changes/removals:

NOTE: Make sure to back up all VFX graphs prior to install! Graphs will probably break, and likely need to be fully rebuilt.

• Refactored all blocks and nodes. Instead of many different properties among the different steps, Fluid and SolverData VFX types are sent instead. This helps to reduce node clutter substantially
• Properties are no longer exposed by default. Instead, they are easily editable within the graph. Users can still expose individual properties, or entire fluids
• Simulation scale has been removed (fixed at 1.0, likely to be fully deleted later). This is no longer needed due to the VFX graph's improved handling of transforms
• Verlet integration is now the new default (see below). Physical properties for fluids will likely need to be adjusted slightly, but this change should help overall stability

Additions:

• Added additional integration methods–Stormer-Verlet and Velocity Verlet (Add additional integrators #3). Also tweaked the Semi-implcit Euler integration to also integrate positons
• Implemented optional external force solvers, and built-in gravity (Implement external force and constraint solvers #2)
• The default FluvioFX graph now has a bunch of helpful sticky notes to help get started

Fixes:

• Particles no longer require a lifetime/alive attribute in order to be compatible with FluvioFX

Misc. changes:

• Updated solver to use the built-in mass attribute in preparation for multi-fluid simulation (Use the built-in mass attribute #8)
• Added FluvioFX templates as a part of the install process
• Moved ReflectionHelpers to its own assembly to get rid of duplicate code
• Minor README updates

Media:

[lilyvelour]

Since this has some sweeping changes, I'll leave this up for a day or two for any public comment before merging.