Improvement: Separate "copy to" and "paste from" clipboard buttons
In order to avoid confusion, two clipboard buttons with separated roles need to be implemented regarding the "SPI write" line edit: one that copies its contents to the clipboard and another one that pastes from the latter. Also, the respective icons need to be changed to reflect the separate roles. This should also affect the button corresponding to the "SPI read" line edit, which only copies the contents from said line edit box to the clipboard.
The buttons should only be enabled when the context applies. In the case of the "copy to clipboard" buttons, these should be enabled only when the respective line edit boxes have content to copy. In the case of the new "paste from clipboard" button regarding the "SPI write" line edit, that should be enabled if and only if the clipboard contains a text string with only hexadecimal characters or spaces.