5675 - move helpers from subx-common into layers

This undoes 5672 in favor of a new plan:

Layers 000 - 099 are for running without syntax sugar. We use them for
building syntax-sugar passes.

Layers 100 and up are for running with all syntax sugar.

The layers are arranged in approximate order so more phases rely on earlier
layers than later ones.

I plan to not use intermediate syntax sugar (just sigils without calls,
or sigils and calls without braces) anywhere except in the specific passes
implementing them.

1 files changed, 0 insertions, 0 deletions

diff --git a/apps/pack b/apps/pack
index f9907948..95782b8b 100755
--- a/apps/pack
+++ b/apps/pack
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