It pastes clipboard contents as code into 8 fields of that dialog.
(Clipboard support works with SDL2 only.)
"Open URL" and "Paste" buttons are placed in the left column under the
picture (because there is no room for 4 buttons in the bottom row).
Commit also adds "dropbox.bmp", which is just a square 115x115 picture.
Such pictures are would be used as Storages logos in that dialog.
In lowres there is no left column, so all 4 buttons are in the same row.
None of them are visible, because they are overflowed. Container has to
be added to continue working on them.
It now hides code fields not just when built with SDL_Net, but also when
LocalWebserver's using default port.
So that's why NETWORKING_LOCALWEBSERVER_ENABLE_PORT_OVERRIDE is defined
in localwebserver.h now.
Now the code contains its own crc16 in it, plus the way checksum is
calculated has changed.
Some online tool calls this exact way of calculating crc16
"CRC16_CCITT_FALSE".
