Remove SysCommsModule pseudo-module
Historically many commands of BBC Micro heritage were not included in UitilyModules, but were separated out into a separate pseudo-module, SysCommsModule, to allow for them to be terminated by any non-letter for compatibility with the BBC Micro.
However with the introduction of Oscli_HashedCommands in August 1999
(and earlier in Ursula branch) this was broken except for *FX, *KEY,
*OPT and *TV, which are handled by a special case making SysCommsModule
redundant.
SysCommsModule is an obsitcle to making the kernel assemble to relocatable AOF as it requires Module_BaseAddr to have 2 different values and therefore be a absolute varaible instead of a section relative symbol.
This commit does not change behaviour with Oscli_HashedCommands enabled
which is the default, except for listing the command under UtilityModule
in *Help output. Which Oscli_HashedCommands disable this change removes
the special behaviour.