ProgramMemory refactor - eliminate copies of memory (#5273)

* refactor program memory for encapsulation and remove special treatment of return values

Signed-off-by: Nick Cameron <nrc@ncameron.org>

* Refactor ProgramMemory to isolate mutation

Signed-off-by: Nick Cameron <nrc@ncameron.org>

* Refactor ProgramMemory

Signed-off-by: Nick Cameron <nrc@ncameron.org>

* Generated output

Signed-off-by: Nick Cameron <nrc@ncameron.org>

* Cache the result of executing modules for their items

Signed-off-by: Nick Cameron <nrc@ncameron.org>

* Compress envs when popped

Signed-off-by: Nick Cameron <nrc@ncameron.org>

* Remove the last traces of geometry from the memory module

Signed-off-by: Nick Cameron <nrc@ncameron.org>

* docs

Signed-off-by: Nick Cameron <nrc@ncameron.org>

* Fixups

Signed-off-by: Nick Cameron <nrc@ncameron.org>

* Frontend

Signed-off-by: Nick Cameron <nrc@ncameron.org>

* Improve Environment GC

Signed-off-by: Nick Cameron <nrc@ncameron.org>

* Fixup mock execution frontend and interpreter, misc bug fixes

Signed-off-by: Nick Cameron <nrc@ncameron.org>

---------

Signed-off-by: Nick Cameron <nrc@ncameron.org>

src/machines/modelingMachine.ts

@@ -1,6 +1,5 @@
 import {
   PathToNode,
-  ProgramMemory,
   VariableDeclaration,
   VariableDeclarator,
   parse,
@@ -708,7 +707,7 @@ export const modelingMachine = setup({
         const modifiedAst = await deleteFromSelection(
           ast,
           selectionRanges.graphSelections[0],
-          kclManager.programMemory,
+          kclManager.variables,
           getFaceDetails
         )
         if (err(modifiedAst)) {
@@ -719,8 +718,7 @@ export const modelingMachine = setup({
         const testExecute = await executeAst({
           ast: modifiedAst,
           engineCommandManager,
-          // We make sure to send an empty program memory to denote we mean mock mode.
-          programMemoryOverride: ProgramMemory.empty(),
+          isMock: true,
         })
         if (testExecute.errors.length) {
           toast.error(errorMessage)
@@ -1087,7 +1085,7 @@ export const modelingMachine = setup({
           selectionRanges,
           'horizontal',
           kclManager.ast,
-          kclManager.programMemory
+          kclManager.variables
         )
         if (trap(constraint)) return false
         const { modifiedAst, pathToNodeMap } = constraint
@@ -1122,7 +1120,7 @@ export const modelingMachine = setup({
           selectionRanges,
           'vertical',
           kclManager.ast,
-          kclManager.programMemory
+          kclManager.variables
         )
         if (trap(constraint)) return false
         const { modifiedAst, pathToNodeMap } = constraint