### Problem description
As suggested in #1904, ImHex could benefit from having the capability of
pasting text directly into the editor.
This also complements the "Copy as... ASCII string" capability already
implemented in the software.
### Implementation description
A new shortcut called `Paste all as string` (to resemble the naming of
the `ASCII string` copy option) now allows to paste plaintext directly.
This shortcut is mapped to the `CTRL + ALT + SHIFT + V` keybind.
Internally, a new flag called `asPlainText` has been added to the
`pasteBytes` function, to minimise code changes and streamline code
readability.
The buffer is a simple type cast of the clipboard, without any
modification applied, which is then handed to the provider's `write`
function.
### Screenshots
The new shortcut is visible in the menu, just below the other paste
options:
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Signed-off-by: BioTheWolff <47079795+BioTheWolff@users.noreply.github.com>
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