Replace an array of const char* literals with a single const char*
literal containing all the messages in the rotating prompt and an
array of alt_u8 containing the offsets of each message within the
literal.
This ends up yielding a larger size reduction than expected, a
healthy 20 bytes, despite a meager 8-byte difference in the size
of local variables and slightly more complex pointer math in
calculating the address of the current message within the string
literal.
The behavior of the menu option was all over the place, and would
easily leave the OSD in a weird state, requiring the user to blindly
do something that completely redraws the OSD.
Fix this by making the behavior similar to that of the userdata import
feature, with the difference of giving a more specific error message
when something goes wrong.
A very simple implementation, as we are very short on remaining
block RAM. Simply blindly copies the entire userdata area to the
SD card. This may subject the SD card to some extra wear, as well
as potentially read-disturb some Flash memory pages, but this would
require more code.
* replace all clock muxes with a single cycloneive_clkctrl to minimize skew
* use a single dynamically configured PLL to comply with cycloneive_clkctrl
* Disable 480p scanlines in auto mode
* Remove inoperable 3x/4x processing modes from 1080i list
* Add 640x512 mode to 480p group and limit 480p sampler option to 525-line modes
* Fix occasional pixel repetion issue after HDMI<->DVI TX switch
* Add "Allow upsample2x" option
* Add comments to some unclear sections
