Removed add-on configurations

The new Spindle Class is a much better solution to
the problem that add-on's were intended to address.

build-all.ps1

@@ -7,26 +7,16 @@ $env:PYTHONIOENCODING="utf-8"
 
 Function BuildMachine($names) {
     $basename = $names[0]
-    $addname = $names[1]
     $env:PLATFORMIO_BUILD_FLAGS = "-DMACHINE_FILENAME=$basename"
     $displayname = $basename
-    if ($addname -ne "") {
-        $env:PLATFORMIO_BUILD_FLAGS += " -DMACHINE_FILENAME2=$addname"
-        $displayname += " + $addname"
-    }
     Write-Output "Building machine $displayname"
     platformio run 2>&1 | Select-String error,Took
     Write-Output " "
 }
 
-# First build all the base configurations with names that do not start with add_
-foreach ($filepath in Get-ChildItem -file .\Grbl_Esp32\Machines\* -Exclude add_*) {
+# Build all the machines
+foreach ($filepath in Get-ChildItem -file .\Grbl_Esp32\Machines\*) {
     BuildMachine($filepath.name, "")
 }
 
-# Then build all of the add-ons on top of a single base
-$base="3axis_v4.h"
-foreach ($filepath in Get-ChildItem -file .\Grbl_Esp32\Machines\add_*) {
-    BuildMachine($base, $filepath.name)
-}
 Remove-Item env:PLATFORMIO_BUILD_FLAGS