Makes the additional layers text autocomplete and the gerber generator use the list of currently active layers
> * Add: utils to get dynamic layers
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> * Change: Use KiCad standard name for layers
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> * Add: description to new util funcs
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> * Fix: only include active layers in layer util funcs
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> * Fix: infinite loop
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> * Change: use util layer functions in processmanager
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> * Remove: hardcoded layers
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> * Change: use new util layer functions in dialog
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> * Change: include comma-separated hint in layer control
* fix#134: remember settings
* chore: move filename to variable in config file
* chore: rename config file
* feat: add new option
* fix: surround user options saving with try catch
* docs: add info about options to readme
Alexander