CURA-12556 formula parser in cura engine

[wawanbreton]

This PR moves the GCode-template replacement algorithm from the Cura front-end to the engine. This allows for more flexibility because the engine has more information when resolving the templates. Especially for the extruders start/end GCodes, which can now be different between each layer.

Requires Ultimaker/CuraEngine#2274
CURA-12556

[github-actions]

Test Results

24 572 tests   - 20   24 570 ✅  - 20   50s ⏱️ ±0s
     1 suites ± 0        2 💤 ± 0 
     1 files   ± 0        0 ❌ ± 0 

Results for commit 93fdf85. ± Comparison against base commit 2e1a12c.

This pull request removes 20 tests.

tests.Machines.TestStartEndGCode ‑ test_startEndGCode_replace[Basic replacement]
tests.Machines.TestStartEndGCode ‑ test_startEndGCode_replace[Condition expression without start]
tests.Machines.TestStartEndGCode ‑ test_startEndGCode_replace[Conditional expression with elsif]
tests.Machines.TestStartEndGCode ‑ test_startEndGCode_replace[Conditional expression with extruder index specified by formula]
tests.Machines.TestStartEndGCode ‑ test_startEndGCode_replace[Conditional expression with extruder index specified by setting]
tests.Machines.TestStartEndGCode ‑ test_startEndGCode_replace[Conditional expression with extruder setting directly specified by index 0]
tests.Machines.TestStartEndGCode ‑ test_startEndGCode_replace[Conditional expression with extruder setting directly specified by index 1]
tests.Machines.TestStartEndGCode ‑ test_startEndGCode_replace[Conditional expression with global setting]
tests.Machines.TestStartEndGCode ‑ test_startEndGCode_replace[Conditional expression with missing end character]
tests.Machines.TestStartEndGCode ‑ test_startEndGCode_replace[Formula inside a conditional expression]
…

♻️ This comment has been updated with latest results.