Split user configuration

[graahnul-grom]

Currently, user configuration file (geda-user.conf) is used to store an important
data that controls behaviour of the tools in the suite. At the same time,
lepton-schematic use that file for program-specific settings, like dialog
geometry. The latter is not important to the user and should be stored separately.
In the draft implementation (wip_cfg_priv_split branch) dialog geometry is stored in geda-priv.conf file in the user configuration directory. However, there is $XDG_CACHE_HOME directory defined in XDG specification that is designed to be used exactly for that.

[graahnul-grom]

Another question is how to name the file containing main window/dialogs data. I think, since the directory name already contains lepton, we could just use something like window.conf or something like this. WDYT?

gui.conf?

[vzh]

👍