Added support for pragma directives

[FreHu]

Example:

[larshp]

Hi, I guess the . should not be highlighted the same color as the pragma?

[FreHu]

Fixed. Now it is also more helpful at discovering invalid states based on pragma documentation:

Pragmas must only occur at certain positions in the source code for reasons of readability:

at the start of a line, after any number of blanks at the end of a line, at the most followed by ".", ",", or ":". but not after ".", ",", or ":". Multiple pragmas may be entered one after another (separated by blanks) at permitted positions.