0.38: The `Variant(fromContent:)` and `Variant(fromContentPtr:)` now make a

Release 0.38:

• Many new framework type tests by Mikhail Tishin and many defaults in
  our core types to match the default values in Godot. Thank you
  Mikhail!

• Methods for built-in types now also follow the pattern of the object
  types of Godot, if the first parameter name matches the last word of
  the method, the name is dropped (Mikhail Tishin)

• Additional diagnostics in the use of macros, it will now flag when a
  @callable is applied to an async or throwing function (Jae Kong)

• Bug fix #342: Fix editor crash when trying to set mismatched value
  to exported property. Mikhail Tishin

• Workaroudn a Swift-ism that passes UnsafeRawPointers representing
  nil, but not being a UnsafeRawPointer - helps catch bugs when we get
  a null back from godot (Miguel)

• Fixes Signal dispatching, these were incorrectly encoded and would
  crash your application (Miguel)

• Fixes #exportGroup was applying the prefix to all subsequent
  exported properties' propertyName - Estevan Hernandez

• Adds support for #exportSubgroups - Estevan Hernandez

• Adds support for keyed indexer for built-in Types (Mikhail Tishin),
  fixes bugs #45 and #46

• Prevent SwiftGodot subclasses from executing in editor by default
  (Mikhail Tishin). This brings a Godot @tool-like setup, you can
  control this by passing calling the @godot macro with either (.tool)
  or (.gameplay).

• Fixes to the Snapping methods (Mikhail Tishin)

• New unary minus operatos for Vectors (Mikhail Tishin)

• Fixes for Hot Reloading (Mikhail Tishin), but we still have an issue
  with Godot or Swift not fully unloading libraries that is being
  tracked (#384

• Fixes exporting of fields named value Airyzz.

• Add support for calling variant methods and access elements of
  arrays held in variants (Miguel)

• Makes the NodePath description method match the Godot method that
  produces their name - as Godot does not surface this method (Miguel)

• New convenience for PackedByteArray: asData() returns the byte
  array as a Swift Data type.

• Color now exposes HSV properties (Mikhail Tishin)

• Variant memory leak fixes. Miguel See the discussion here for
  additional information:
  #388

• StringName and GString are now Hashable (Mikhail Tishin)