Describe your enhancement idea

General:
Error and success messages should be reset when leaving the screen (right now e.g. click "CREATE LNDHUB ACCOUNT" with empty Host, leave the view and come back -> you will still see the error).

LNDHub:

1. Disable "CREATE LNDHUB ACCOUNT" button if Host is empty. In case user is setting up an existing account: Disable button if Host or Username or Password is empty.
2. Host input typing: block all illegal hostname-chars
3. Host input pasting: auto clean leading/trailing white spaces and line breaks, display error message if illegal chars within data were pasted
4. Existing Account->Username input typing: block space chars
5. Existing Account->Username input pasting: auto clean leading/trailing white spaces and line breaks, display error message if space char within data was pasted
6. Existing Account -> Password input: no blocking of space chars, no autoCorrect

LND (Lightning Node Connect):

1. Pairing Phrase input typing: block all chars but a-z, A-Z and space char (also block space char if it is the first char in the input, also block space char if it is more than 1 space char in a row)
2. Pairing Phrase input pasting: auto clean leading/trailing white spaces and line breaks, also auto-replace more than 1 space char in a row into 1, also auto-clean line breaks in between words, display error message if illegal chars pasted
3. Pairing Phrase input focus loss: display error message if pairing phrase is not exactly 10 words, no error message if pairing phrase is empty -> user obviously wants to do other stuff first
4. Custom Mailbox Server input typing: block all illegal hostname-chars (but allow :)
5. Custom Mailbox Server input pasting: auto clean leading/trailing white spaces and line breaks, display error message if illegal chars pasted
6. Custom Mailbox Server input focus loss: display error message if not formatted host:port or host (default port 443 ist used in this case), no error message if custom mailbox server is empty -> user obviously wants to do other stuff first
7. Disable "SAVE NODE CONFIG" button if Pairing Phrase word count is != 10 (or if Custom Mailbox Server is used, but it's not formatted host:port or host).

LND (Rest) / Core Lightning (CLNRest) / Core Lightning (c-lightning-REST):

1. Host input typing: block all illegal hostname-chars
2. Host input pasting: auto clean leading/trailing white spaces and line breaks, display error message if illegal chars within data were pasted
3. LND/c-Lightning-REST: Macaroon input typing: block non-hex chars (although it shouldnt really happen that users type a macaroon)
4. LND/c-Lightning-REST: Macaroon input pasting: auto clean leading/trailing white spaces and line breaks, display error message if illegal chars within data were pasted
5. CLNRest: Rune input typing: block illegal chars (although it shouldnt really happen that users type a rune)
6. CLNRest: Rune input pasting: auto clean leading/trailing white spaces and line breaks, display error message if illegal chars within data were pasted
7. Disable "SAVE NODE CONFIG" button if Host or Macaroon/Rune is empty (empty REST Port is ok, since Zeus will try default port)

We should improve error handling, when you enter a well formatted but invalid Macaroon, right now you get this: