snippets: remove unnecessary spaces before semicolons
snippets: make use of spaces and parens more consistent

This revision removes a few unnecessary parens from if / elsif
statements in the process templates, making them more consistent with
the corresponding if / elsif templates.

This also removes extra spaces that were put around the sensitivity
lists of the process statements. This also makes things more
consistent, since these were the only places where such extra spaces
were added.
Merge pull request #3 from AngelEzquerra/master

Improvements to the VHDL snippets