Get rid of deprecation warnings for rawurlencode() and strpos() (#380)

[g41797]

Q	A
Is bugfix?	✔️
New feature?	❌
Breaks BC?	❌
Fixed issues	#380

"Deprecated" warning now showed for trim(), but it should be fixed in UrlManager.php
(another repo)

devenv:

• PhpStorm 2023.3.1
• PHP 8.3.1
• Xdebug v3.3.1

[what-the-diff]

PR Summary

• Improved Null Handling in 'OAuth1.php'
  In the file 'OAuth1.php', a series of changes have been made to ensure the system does not encounter unexpected problems if some values are missing or undefined. This involves using a null coalescing operator to flag certain items as empty strings if they're not present. The improved handling includes:
  • The URL
  • The method
  • The result of http_build_query
  • The consumer secret
  • The token secret

This results in a more robust behavior when these values aren't provided, reducing the risk of system errors and promoting smoother system operation overall.

[samdark]

@g41797 do you want to fix the rest of compatibility issues? See tests failing.

[g41797]

"Deprecated" warning (showed for trim()) are fixed by PR#20090

[samdark]

Merged that one.