config-files can now use OS environment-variables anywhere in the [global] config section cbd82b6e52bbed
by default, only the syntax ${VAR} is supported, not $VAR or %VAR%
previously, a small handful of global-options already supported this (c lo hist dbpath ssl_log), but they also supported the $VAR syntax, which is no longer the case
if the old $VAR syntax is detected, copyparty will crash on startup, suggesting the following remedies (choose one!) in the log:
update the config-value to the new ${VAR} syntax (recommended)
allow the old syntax with global-option --env-expand 1 (risky)
ignore the old syntax and only expand the new syntax with global-option --env-expand 2
disable all environment-variable expansions with PRTY_NO_ENVEXPAND=1
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