Batcher 0.5 Released

Changes to the export settings:

Added a button named Options... in the main dialog to adjust options previously only available when adding the Export procedure.
Rearranged export settings horizontally, both in Export Layers and Export Layers (Quick).
Renamed Save in Folder to Folder and Save As to Name for brevity.
The native file format dialog is no longer displayed by default. File format options are now adjusted in the export options (displayed by pressing the Options... button). This behavior can be toggled back if desired, particularly when you need to choose the image metadata to preserve (this can currently be adjusted only via native file format dialogs).
By default, when a file about to be exported already exists with the same name, the new file will be renamed. This was inconsistent previously (e.g. when running non-interactively, the default was to skip the new files).
The default export folder is now the Pictures user folder instead of Documents.
The file extension is now validated automatically. An invalid file extension is automatically reverted to the last valid value instead of displaying warnings.
The overwrite prompt is now displayed in Edit/Export Layers (Quick) if Show This Dialog is checked.

Changes to the Export procedure:

For Export Layers, the Export procedure now performs additional export instead of overriding the default export. The procedure name for Export Layers is now Also export as... to reflect this change. The name changes automatically as you modify the file extension (e.g. Also export as PNG if the file extension is png).
For Export Layers, when the Export procedure is added, values of the options are copied from the default export (e.g. the output folder will be identical to the one currently selected in the main dialog).
Add a new option If a file exists: that allows skipping the dialog asking the user to handle existing files and setting a fixed mode for all files.
Removed the Preserve layer name after export option. The layer name is now always preserved.

Other changes:

The Rename procedure for Export Layers now performs renaming on top of the default renaming (the text entry next to Name) instead of overriding it.
File load and file save procedures can no longer be added as custom procedures due to being redundant (loading a file would have no effect and file save procedures are already covered by the Export procedure).
The plug-in no longer crashes if the automatic update of plug-in settings to the latest version fails. Instead, the settings are reset.

Bug fixes:

Fixed unchangeable file extension in Export Layers (Quick).
Fixed overwrite prompt not being displayed for Export procedures for Edit Layers.
Fixed a crash when starting the plug-in if text layer(s) were selected in the preview and plug-in settings were saved.
Fixed a crash when in-dialog warning messages were displayed on plug-in startup (e.g. if the plug-in was saved with an ill-formatted file extension).
Removed the “Flatten” option from Merge Back-/Foreground as it was unsupported and caused merging to fail.