#1508 Structured Text Lexer. Coloring for enumeration member malfunctions.

[Pavel]

Coloring is wrong if enumeration member contains characters, used for DATE and TIME vars (limited character set).

The following example demonstrates the issue:

BYTE#16#BF
( correct coloring )

TYPE ENUM_TYPE: (ONE, TWO, THREE, FIVE); END_TYPE
VAR_INPUT ENUM_VALUE: ENUM_TYPE#FIVE; END_VAR
( wrong coloring for 'FIVE')

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There is a lexer fix in attachment.

[Neil Hodgson]

Committed as [b74b4a].