Substyles for Lua and HTML can highlight more sets of identifiers

Substyles are now implemented for the Lua and HTML lexers to allow styling 
many sets of identifiers.

For Lua, this is simple, just allowing more styling of identifiers that 
start from SCE_LUA_IDENTIFIER. The Lua lexer already offered multiple 
keyword lists so this mostly enhances consistency between lexers.

For HTML, it is much more significant as the lexer only provides 6 keyword 
lists where each is for one specific type of content: tags & attributes, 
JavaScript, Basic, Python, PHP, and SGML. The new substyles feature allows 
each of these, except for SGML, to have multiple identifier lists with 
different visual styles. Two of these cases are further split with separate 
sets for tags and attributes (instead of a combined set) and separate sets 
for client-side and server-side JavaScript as the different execution 
locations may have different APIs available.

As client-side Basic and Python are not popular, client-side reuses the 
server-side sets.

Both lexers allow 64 substyles. For Lua, these start at the standard value 
128 but for HTML, they start at 192 to allow a larger contiguous range of 
base styles.

While it would make sense to support substyles for SGML, this is not done 
as it is more difficult to implement than the other cases.

The substyles are checked when a lexeme in one of these base styles is 
applied: SCE_H_TAG, SCE_H_ATTRIBUTE, SCE_HJ_WORD, SCE_HJA_WORD, 
SCE_HB_WORD, SCE_HP_WORD, and SCE_HPHP_WORD. The previously-defined keyword 
lists have priority over the substyle sets.

While the implementation handles most of the obvious cases, there may be 
more cases desired so it would be best to discuss them before this is in 
common use so hard to change. For example, if client-side Basic is more 
popular than I thought then different sets for client- and server-side 
Basic should be defined now as this would be difficult to retrofit in a 
compatible way. The downside of separate lists is that identifiers may have 
to be added to both.

See this documentation for the substyles API or examine SciTE's source code:
https://www.scintilla.org/ScintillaDoc.html#SCI_GETSUBSTYLEBASES

Committed mostly in these change sets:
https://github.com/ScintillaOrg/lexilla/commit/61d22324cbcd1f13a510dbba370b825d5ca4f8e0
https://github.com/ScintillaOrg/lexilla/commit/1c6e3e5edd29c680a4098d9a4bcac4f3733b700d

Neil

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