Uthernet II: add extended feature to virtualise DNS requests.
. This allows pure TCP/UDP sockets to run *without* MACRAW requests (and so without libpcap).
. Raw sockets will not work.
. Add configuration for Virtual DNS.
libpcap: ensure all functions check if the library is loaded before using it.
Uthernet 1: do NOT overwrite tfe_cannot_use as it should only reflect the availability of npcap on *this* system.
Add Copyright notice, and mention Virtual DNS in html.
Extend LBR so that it includes the control-flow on a taken interrupt
Add a new command 'brkint <0|1>' to support Break on Interrupt
Internal: in core emulation loop, moved IRQ/NMI check to start of loop so that just the "interrupt vectoring" case can be single-stepped (instead of previously opcode + interrupt vector).
Debugger help chm: update Breakpoints section to include BRK, BRKOP and BRKINT
Support these new cards in slots 3, 4 or 5; based on code from Lukazi.
- extend Configuration's Input prop sheet page.
- add save/load snapshot for both cards.
- add command line switch for alt controller type (for SNES MAX card).
Change to using Registry's 'Configuration\Slot 3' for slot 3 cards (Uthernet, 4Play & SNES MAX).
Update help doc.
Change to using Registry's 'Configuration\Slot n' for disk ii image pathnames (was 'Preferences').
Delete Registry's 'Configuration\Slot n' section each time there's a change of card.
Add same functionality to conf.ini.
LoadConfiguration(): load from the new Slot-n section (or otherwise the old legacy key).
Only update Registry's 'Starting Directory' for s6,d1.
Update help doc.
. cmd-line (-swap-buttons) or GUI "Swap 0/1" now swaps buttons 0/1 for all devices
. ie. Open/Solid Apple keys, real joystick, mouse or Num Pad keys
+ update the docs
