Revert "[PixelOverlay] Thread part of FPP::MemoryMap::TextMessage()"

This reverts commit 45ac77e3f02cef9bfd1bc748657a697236be116b.

The Pi is taking too long to spin up a new thread in Perl so this change
needs to be reverted and redone to have a long-running thread.
(cherry picked from commit 1494cafd55035bfedd4ba061ceba149f2185f538)
(cherry picked from commit 817e74d700b800e8cb116cb5359d277446ebdc8e)
[Network] Disable power management on wlan0 (again)
(cherry picked from commit f5ccf46883efb2fb90af834f4e33fb06f613390c)
(cherry picked from commit f3a142ac0d9ba64c8af9c70eeae954620b435a67)
[Settings] Move "setting not found" log to excessive level
(cherry picked from commit 2b3938286bc3ddce2133179ee27321df3e421968)
(cherry picked from commit 33c14c05719d9b8e3cf3d709bdb1908695dbc17f)