JS: pull the parsing context into the Keyword struct we pass around
JS: pull the parsing context into the Keyword struct we pass around

Cuts down on the arguments a little bit.

Signed-off-by: Harvey Harrison <eadbd6b462bf3c97df0300a934c12bc2e5d1fe51@ausenco.com>

jaamsim/jaamsim,jaamsim/jaamsim,jaamsim/jaamsim,jaamsim/jaamsim