Clean up include, autoboot, split windows, shorten start.

Drop startup timeout to 100ms.
Clean up exceptions in include.
Cleanup stack in autoboot.
Split out windows into a second string, to work around overflow issue.

windows/load_extra.fs

@@ -0,0 +1,16 @@
+\ Copyright 2023 Bradley D. Nelson
+\
+\ Licensed under the Apache License, Version 2.0 (the "License");
+\ you may not use this file except in compliance with the License.
+\ You may obtain a copy of the License at
+\
+\     http://www.apache.org/licenses/LICENSE-2.0
+\
+\ Unless required by applicable law or agreed to in writing, software
+\ distributed under the License is distributed on an "AS IS" BASIS,
+\ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+\ See the License for the specific language governing permissions and
+\ limitations under the License.
+
+( Load extra things that didn't fit in main boot string. )
+windows boot_extra forth evaluate