Added functionality to handle full (FQN) path for default paths

The default paths can now be either a sub folder name or a specific directory with a fully qualified name (FQN) having a drive letter.

This allows users to optionally specify a specific directory to use when the ctrl key is used while selecting "Paste Into File" on the context menu.

Because of this added feature, the command line options have been changed from TextSubDir and ImageSubDir to TextDefaultDir and ImageDefaultDir.
The associated registry keys have also been change to reflect the command line name changes.

Switch ctrl and shift key functionality

Switch ctrl and shift key functionality to match other variations of PasteIntoFile.

New action when using Ctrl and/or Shift key while select

1. Added functionality to automatically create file (without window prompt) when Ctrl key is held while choosing [Paste Into File] in the context menu.
2. Added implementation to append default sub folder to the current directory when Shift key is held while choosing [Paste Into File] option.
3. Added command line options to change the default sub folder options. (TextSubDir and ImageSubDir)
4. Made all command line options case insensitive.
5. Changed logic so only image file types are displayed in combo list for an image file, and only text file types are displayed in combo list for a text file type.
6. Updated the year in Copyright text from 2014 to 2022.
7. Updated version to version 1.6