Feature request: Plugin should support environment variables and relative paths for use in the configuration file

[dinkumoil]

Description

It is not possible to use environment variables or relative paths for the keys progPath and workDir in the configuration file. This is a problem especially when one wants to use a portable version of Notepad++. Moreover, to be able to use environment variables could be helpful when it comes to creating configurations that can be used for 32 bit and 64 bit versions of Notepad++.

Proposed Solution

Both issues can be solved easily by doing appropriate Win32 API calls. As the base path for relative paths used in the configuration file the plugins config dir could be used. This would be a reasonable solution and there already exists the NPPM_GETPLUGINSCONFIGDIR message in the Notepad++ plugin API to retrieve this path.