Oxygen 0.2.2

Added

• The Context panel can fill every query the preview has no value for (0, 1 or an empty string) in one step, clear
  them, and nudge or scale every number set for a query at once, as it already could for variables.
• When a query has no value in the preview, the Problems panel says why: it needs an entity, the game can't run
  it in particle Molang, or it returns a struct to assign to a variable.

Changed

Measured in the game with new tests in the test pack (t66–t80, e13–e31):

• Queries for world generation or tags (q.heightmap, q.above_top_solid, q.noise, the biome tags,
  q.any_tag) are load errors, as in the game, and their field uses its default. Completions no longer offer them.
• Names with more dots (v.a.b) are structs: v.c = v.a copies every member, reading v.a gives 0, and setting
  a member replaces a number v.a held. ?? on a member and temp members are flagged as warnings, as the game
  logs them, and still run.
• Bone queries assigned to a variable fill the struct with zeros, as the game does in particles, where they never
  find a bone. Used any other way they're a load error.
• q.life_time and q.delta_time read 0 in particles.
• An event's pre_effect_expression runs after the spawned effect's creation_expression.
• loop has no 1,024 cap, and a fractional count rounds up.
• <, >, + and the other numeric operators on a string are load errors.
• An assignment has a value: v.a = (v.b = 3) sets both.
• Children of a particle's events on an entity appear where the game puts them: emitter_bound children at the
  emitter, emitter children at the particle (at the emitter when the parent keeps its particles in local space).
• emitter_local_space with rotation but no position is ignored, as the game rejects it.
• bind_to_actor: false effects use the world's axes.