add utility script and build_env to avoid sourcing Env.Host.sh

The goal is to able to do partial build without having
to source Env.Host.sh into one's environment

There is 2 way to use this:

1/
copy the scripts lo_find_src_root and lo_proxy_start
somewhere in your PATH, and
then you can add
alias build='lo_proxy_start build'
alias deliver='lo_proxy_start deliver'
in your .bashrc

at that point you can use build and deliver anywhere in the source tree
without the need to source anything.
This allow you to switch from one source tree to another.
the proper SRC_ROOT will be determined automatically based
on the current working directory

2/
source build_env

build_env only source the bare minimum to allow build and make to work
for the associated source tree.
If you want to work in a diffrent tree, you need to resource

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