neogeo: Split into real models:

* Moved common stuff (mostly video) into a base memory map.
* Split common edge connector inputs into JAMMA and MVS.
* Added clones with different numbers of game slots, edge connector, controller ports, memory card, and speakers.
* Based fixed-software drivers on MV-1 JAMMA board configuration.
* Removed memory card and controller ports from single-PCB games and converted to mono output.
* Coin lockouts/counters still not connected, and LED/EL output isn't suppressed for variants that lack it.

(nw) suppress leading space in RAM option names

src/devices/machine/ram.cpp

@@ -75,6 +75,10 @@ ram_device::extra_option_vector calculate_extra_options(const char *extra_option
 	bool done(false);
 	for (std::string::size_type start = 0, end = options.find_first_of(','); !done; start = end + 1, end = options.find_first_of(',', start))
 	{
+		// ignore spaces
+		while ((end > start) && (options.length() > start) && ((' ' == options[start]) || ('\t' == options[start])))
+			++start;
+
 		// parse the option
 		std::string ram_option_string(options.substr(start, (end == -1) ? -1 : end - start));
 		u32 const ram_option = parse_string(ram_option_string.c_str());